Fix documentation:
authorRichard Smith <richard-llvm@metafoo.co.uk>
Thu, 11 Jul 2013 00:27:05 +0000 (00:27 +0000)
committerRichard Smith <richard-llvm@metafoo.co.uk>
Thu, 11 Jul 2013 00:27:05 +0000 (00:27 +0000)
commitccfc9ffcbe70c001d5c291e55f58841109a91d74
treeb97ff78d089657f1231ad02352e9fb1941f93f9f
parenta2aeb8e8e159bc4f55e350ec997cb7d5036fe7dd
Fix documentation:

  #if defined(__has_foo("X")) && __has_foo("X")

is not a correct way to portably use __has_foo, because it is expanded to

  #if 0 && 0("X")

... which is ill-formed.

Also add a missing ')'.

llvm-svn: 186047
clang/docs/LanguageExtensions.rst