Implement codegen support for lowering "library builtins" like __builtin_isinf 
to their corresponding library routines (e.g. isinf).  This allows us to handle
all the stuff in macos math.h, and other stuff as it's added to *Builtins.def.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41634 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed