[llvm] [LoadStoreVectorizer] Allow redundant stores (PR #169946)

[Drew Kersnar via llvm-commits]

dakersnar wrote:

>Why? The vectorizer should not be making attempts to handle patterns that should have optimized away already

I agree with Matt. Putting too much responsibility on the Vectorizer seems like a mistake, when this isn't really the job for the Vectorizer. Just because the Vectorizer can incidentally handle this problem doesn't mean it should.

>We either need to add another DSE pass somewhere

I lean towards this being the right solution.

https://github.com/llvm/llvm-project/pull/169946