[llvm] [LLVM][LICM] Skip unrelated accesses when looking for hoist/sink conflicting instructions. (PR #195132)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

Just a rebase plus a new test for the case I am trying to fix, which failed to hoist the write call regardless of https://github.com/llvm/llvm-project/pull/187529

I'm still digesting what it means to remove the clobber walk but I see this PR as being a small refactor given the ModRef check already existed?

https://github.com/llvm/llvm-project/pull/195132