[clang] [llvm] [AMDGPU] Remove icmp and fcmp intrinsics and builtins (PR #208183)

[Jay Foad via cfe-commits]

jayfoad wrote:

> Shouldn't just rip out the builtins,

So then they should not be [deprecated](https://github.com/llvm/llvm-project/blob/4f339eedfce6cc7bf8ea9f6737224629dd6e7d0b/clang/include/clang/Basic/BuiltinsAMDGPU.td#L316)?

> should reimplement with the ballot intrinsic.

#208231


https://github.com/llvm/llvm-project/pull/208183