Add support for __builtin_expect which is needed for assert, 
among other things.

Also change a codegen warning to dump to stderr so it doesn't
mess with -emit-llvm output



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44497 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed