[llvm] [NFC] Add GIntrinsic::setIntrinsicID (PR #106236)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

You still loose at dead code.

https://github.com/llvm/llvm-project/blob/main/llvm/lib/CodeGen/GlobalISel/LoadStoreOpt.cpp
seems to be really careful to use the builder to create instructions and `eraseFromParent()`  to delete instructions. I couldn't  find mutations.

https://github.com/llvm/llvm-project/pull/106236