Add comment explaining this mysterious macro name.
authorRichard Smith <richard-llvm@metafoo.co.uk>
Mon, 31 Oct 2016 20:25:52 +0000 (20:25 +0000)
committerRichard Smith <richard-llvm@metafoo.co.uk>
Mon, 31 Oct 2016 20:25:52 +0000 (20:25 +0000)
commit90f454aeb9807c038c7d05dbf1a7482f425c7c7b
tree3a71e9b271089fea7468b81fd280e9e8066d8fdc
parent1f7deb8908c33632be1c74c9add7c6e6d1d4a852
Add comment explaining this mysterious macro name.

llvm-svn: 285631
clang/lib/Frontend/InitPreprocessor.cpp