Reorganize predefined macros for all Windows targets.

This adds an option to set the _MSC_VER macro without
recompiling. This is very useful when testing compatibility
with the Windows SDK and c++stdlib headers.

-fmsc-version=<version> (defaults to VS2003 (1300))

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@116999 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index ada41b4..4461703 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -74,6 +74,7 @@
   PARSE_LANGOPT_BENIGN(HexFloats);
   PARSE_LANGOPT_IMPORTANT(C99, diag::warn_pch_c99);
   PARSE_LANGOPT_IMPORTANT(Microsoft, diag::warn_pch_microsoft_extensions);
+  PARSE_LANGOPT_BENIGN(MSCVersion);
   PARSE_LANGOPT_IMPORTANT(CPlusPlus, diag::warn_pch_cplusplus);
   PARSE_LANGOPT_IMPORTANT(CPlusPlus0x, diag::warn_pch_cplusplus0x);
   PARSE_LANGOPT_BENIGN(CXXOperatorName);