[llvm] [LLVM][TableGen] Add overloaded intrinsic name conflict checks (PR #109314)

[Rahul Joshi via llvm-commits]

jurahul wrote:

@nikic @arsenm @jayfoad This is a WIP MR for doing these checks, but I need some feedback on 2 items before I can finish it. See comments I posted in the PR.

https://github.com/llvm/llvm-project/pull/109314