[llvm] [AArch64][GISel] Skip SME call-attr checks on non-SME targets (PR #190135)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

> Is there any way to add a test for this?

not that i can think of unless I'm missing something? This just avoids the expensive fallback checks for non-SME targets since it would never fallback (and still doesn't of course), so nothing is really changing

https://github.com/llvm/llvm-project/pull/190135