[llvm] [LLVM][TableGen] Check name conflicts between target dep and independent intrinsics (PR #109826)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> WDYM? We could fall back to looking up in the target independent list if the lookup in the target specific one fails? And this case will actually work as expected? If so, yeah, I agree it's possible, but no one is asking for that.

It's restricting the set of possible intrinsic names. It just happens that it's unlikely that a real operation name doesn't conflict with a target name 

https://github.com/llvm/llvm-project/pull/109826