[llvm] RuntimeLibcalls: Add methods to recognize libcall names (PR #149001)

[Alexander Kornienko via llvm-commits]

alexfh wrote:

> After [0b7a95a](https://github.com/llvm/llvm-project/commit/0b7a95a6fd81b31634a3723a0bea6d9d91bbc230) llvm/test/TableGen/RuntimeLibcallEmitter.td started being flaky in our builds.

I've just found https://github.com/llvm/llvm-project/commit/bd7db754895ed3b51388ec549cd656c770c17587, which probably fixes this.

https://github.com/llvm/llvm-project/pull/149001