_STD -> _VSTD to avoid macro clash on windows

llvm-svn: 134190
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: ce48a1137d56d368828d360e5f2a8162bac6517c
diff --git a/include/ios b/include/ios
index b0e7ab9..e2f2b6f 100644
--- a/include/ios
+++ b/include/ios
@@ -266,8 +266,8 @@
     enum seekdir {beg, cur, end};
     typedef seekdir seek_dir;
 
-    typedef _STD::streamoff streamoff;
-    typedef _STD::streampos streampos;
+    typedef _VSTD::streamoff streamoff;
+    typedef _VSTD::streampos streampos;
 
     class Init;
 
@@ -776,8 +776,8 @@
 basic_ios<_CharT, _Traits>::swap(basic_ios& __rhs)
 {
     ios_base::swap(__rhs);
-    _STD::swap(__tie_, __rhs.__tie_);
-    _STD::swap(__fill_, __rhs.__fill_);
+    _VSTD::swap(__tie_, __rhs.__tie_);
+    _VSTD::swap(__fill_, __rhs.__fill_);
 }
 
 template <class _CharT, class _Traits>