[llvm] [WIP][X86] Add addlike PatFrags for AVX-512 disjoint OR folding (PR #166015)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

please can you review the test failures - shift-i512.ll just need regenerating with the update script, not sure about the GISel changes

https://github.com/llvm/llvm-project/pull/166015