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

[Alex Voicu via cfe-commits]

AlexVlx wrote:

> I'm generally very unhappy about any kind of functionality that can cause compilation failures either because the optimizer did not optimize enough (including at O0) or because it optimized too much (producing code patterns that are no longer recognized as trivially dead).

Fortunately, that wouldn't be the case here, I don't think, unless you have something specific in mind (asides from the inquiry about what happens with now inaccessible blocks / dead functions, which I'll address where it was asked).

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