Emulate MSVC's preprocessor macro argument separator behavior by not considering commas from nested macro expansions as argument separators. Fixes parsing of VS 2012 headers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163022 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed