[llvm] [AArch64] Add clmul/h/r v16i8/v8i16/v4i32/v2i64 test coverage (PR #182305)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> A lot of these should already be tested I believe?

I couldn't find any of the clmulr/h patterns (half of which crash)? And the v2i64 coverage seemed to be purposely designed to avoid the legalizer crash we're seeing.

https://github.com/llvm/llvm-project/pull/182305