[clang] [llvm] [AMDGPU][clang][CodeGen][opt] Add late-resolved feature identifying predicates (PR #134016)

[John McCall via cfe-commits]

rjmccall wrote:

Right, but the code still contains some kind of check to decide which version of the library function to call. Maybe it's implicit by multiversioned functions or something, but there's *something* in the source code, because if the user just writes a kernel that does nothing but call a builtin that's not always available, you've got a problem. My question is just whether that's something we can leverage.

And if these checks are all done in the library, the library can of course just be annotated.

https://github.com/llvm/llvm-project/pull/134016