PR6515: Implement __builtin_signbit and friends.

I'm reasonably sure my implementation is correct, but it would be nice if
someone could double-check.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97864 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed