[libcxx] Fix usage of _C2, which is a "nasty macro" in some environments

The problem was pointed out in https://reviews.llvm.org/D48896#inline-475775.

llvm-svn: 345834
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 8df1d5a54673e7d94824f6c169b1618284f32ecf
diff --git a/include/map b/include/map
index 472ac31..d3c59f3 100644
--- a/include/map
+++ b/include/map
@@ -1323,33 +1323,33 @@
     {
         return __tree_.template __node_handle_extract<node_type>(__it.__i_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(map<key_type, mapped_type, _C2, allocator_type>& __source)
+    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(map<key_type, mapped_type, _C2, allocator_type>&& __source)
+    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multimap<key_type, mapped_type, _C2, allocator_type>& __source)
+    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multimap<key_type, mapped_type, _C2, allocator_type>&& __source)
+    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
@@ -1942,33 +1942,33 @@
         return __tree_.template __node_handle_extract<node_type>(
             __it.__i_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multimap<key_type, mapped_type, _C2, allocator_type>& __source)
+    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         return __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multimap<key_type, mapped_type, _C2, allocator_type>&& __source)
+    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         return __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(map<key_type, mapped_type, _C2, allocator_type>& __source)
+    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         return __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(map<key_type, mapped_type, _C2, allocator_type>&& __source)
+    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
diff --git a/include/set b/include/set
index 80cc7b0..ccf785a 100644
--- a/include/set
+++ b/include/set
@@ -513,7 +513,7 @@
 
 #if _LIBCPP_STD_VER > 11
         template <class _InputIterator>
-        _LIBCPP_INLINE_VISIBILITY 
+        _LIBCPP_INLINE_VISIBILITY
         set(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
             : set(__f, __l, key_compare(), __a) {}
 #endif
@@ -569,7 +569,7 @@
         }
 
 #if _LIBCPP_STD_VER > 11
-    _LIBCPP_INLINE_VISIBILITY 
+    _LIBCPP_INLINE_VISIBILITY
     set(initializer_list<value_type> __il, const allocator_type& __a)
         : set(__il, key_compare(), __a) {}
 #endif
@@ -707,33 +707,33 @@
     {
         return __tree_.template __node_handle_extract<node_type>(__it);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(set<key_type, _C2, allocator_type>& __source)
+    void merge(set<key_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(set<key_type, _C2, allocator_type>&& __source)
+    void merge(set<key_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multiset<key_type, _C2, allocator_type>& __source)
+    void merge(multiset<key_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_unique(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multiset<key_type, _C2, allocator_type>&& __source)
+    void merge(multiset<key_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
@@ -984,7 +984,7 @@
 
 #if _LIBCPP_STD_VER > 11
         template <class _InputIterator>
-        _LIBCPP_INLINE_VISIBILITY 
+        _LIBCPP_INLINE_VISIBILITY
         multiset(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
             : multiset(__f, __l, key_compare(), __a) {}
 #endif
@@ -1048,7 +1048,7 @@
         }
 
 #if _LIBCPP_STD_VER > 11
-    _LIBCPP_INLINE_VISIBILITY 
+    _LIBCPP_INLINE_VISIBILITY
     multiset(initializer_list<value_type> __il, const allocator_type& __a)
         : multiset(__il, key_compare(), __a) {}
 #endif
@@ -1185,33 +1185,33 @@
     {
         return __tree_.template __node_handle_extract<node_type>(__it);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multiset<key_type, _C2, allocator_type>& __source)
+    void merge(multiset<key_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(multiset<key_type, _C2, allocator_type>&& __source)
+    void merge(multiset<key_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(set<key_type, _C2, allocator_type>& __source)
+    void merge(set<key_type, _Compare2, allocator_type>& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");
         __tree_.__node_handle_merge_multi(__source.__tree_);
     }
-    template <class _C2>
+    template <class _Compare2>
     _LIBCPP_INLINE_VISIBILITY
-    void merge(set<key_type, _C2, allocator_type>&& __source)
+    void merge(set<key_type, _Compare2, allocator_type>&& __source)
     {
         _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
                        "merging container with incompatible allocator");