[NFC][libc++] Consistently use spaces to indent

rdar://problem/19988944

llvm-svn: 338933
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 7c3492b00d99c81d4a58a8015dbe313eabaea799
diff --git a/include/__tree b/include/__tree
index af9b961..3b3586c 100644
--- a/include/__tree
+++ b/include/__tree
@@ -857,7 +857,7 @@
     __tree_iterator operator--(int)
         {__tree_iterator __t(*this); --(*this); return __t;}
 
-    friend _LIBCPP_INLINE_VISIBILITY 
+    friend _LIBCPP_INLINE_VISIBILITY
         bool operator==(const __tree_iterator& __x, const __tree_iterator& __y)
         {return __x.__ptr_ == __y.__ptr_;}
     friend _LIBCPP_INLINE_VISIBILITY
@@ -1488,7 +1488,7 @@
     void __copy_assign_alloc(const __tree& __t, true_type)
         {
         if (__node_alloc() != __t.__node_alloc())
-        	clear();
+            clear();
         __node_alloc() = __t.__node_alloc();
         }
     _LIBCPP_INLINE_VISIBILITY
@@ -1830,7 +1830,7 @@
         __node_traits::propagate_on_container_move_assignment::value &&
         is_nothrow_move_assignable<value_compare>::value &&
         is_nothrow_move_assignable<__node_allocator>::value)
-        
+
 {
     __move_assign(__t, integral_constant<bool,
                   __node_traits::propagate_on_container_move_assignment::value>());