[llvm] [Transform][LoadStoreVectorizer] allow redundant in Chain (PR #163019)

[Gang Chen via llvm-commits]

cmc-rep wrote:

No one answers my question in discourse. I feel it may be difficult to convince people that that specific function in VectorCombine only creates noise. My change to LoadStoreVectorizer not only clean up that case, it also brings some benefit as some test changes are showing.

https://github.com/llvm/llvm-project/pull/163019