[llvm] [GISel][AArch64] Allow PatLeafs to be imported in GISel which were previously causing warnings (PR #140935)

[Pierre van Houtryve via llvm-commits]

https://github.com/Pierre-vh commented:

Can you add some TableGen tests for this?
You can write a pattern that triggers these new opcode then check everything is where it belongs

https://github.com/llvm/llvm-project/pull/140935