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

[Rahul Joshi via llvm-commits]

jurahul wrote:

@nikic (me and @arsenm to an extent, based on the PR approval) are arguing that the extra complexity is worth it as it avoids hard-to-debug issues that developers may be running into and working around by trial and error.

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