[llvm] Add SD matchers and unit test coverage for ISD::VECTOR_SHUFFLE (PR #119592)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave approved this pull request.

LGTM w/ minor comments.

I guess you need helps to merge this (after you address any outstanding comments)?

https://github.com/llvm/llvm-project/pull/119592