[clang] [llvm] [RFC][CodeGen] Add generic target feature checks for intrinsics (PR #201470)

[Shilei Tian via cfe-commits]

shiltian wrote:

> With early intrinsic feature check it fails gracefully. But in essence it is same `feature check` ? or am I misunderstanding something.

Actually, if you have access to ROCM-26439, it's a good example of how an instruction's predicate can take effect very late in the pipeline, yet cause a failure much earlier in a way that's quite confusing.

https://github.com/llvm/llvm-project/pull/201470