[llvm] [LLVM][TableGen] Check overloaded intrinsic mangling suffix conflicts (PR #110324)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> We'd need to tag 225 intrinsics. If instead we say that the tag can be on either the overloaded intrinsic or the one that shares the prefix with the overloaded one, its 113 (overloaded) intrinsics that we'd need to tag.

Adding a bit to change the naming rules is the worst possible outcome. I think we do this, or we do nothing 

https://github.com/llvm/llvm-project/pull/110324