PR4836, part 1: add Sema support for __builtin_isnan and friends; they 
are apparently used by Solaris libc despite the fact that clang claims 
to be compatible with gcc 4.2, which doesn't support them.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80610 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed