[llvm] [LoadStoreVectorizer] Postprocess and merge equivalence classes (PR #114501)

[Vyacheslav Klochkov via llvm-commits]

v-klochkov wrote:

Dear reviewers and colleagues (@arsenm , @jlebar , @valerydmit @michalpaszkowski ) this note is a friendly ping.
Please review the patch, it is an isolated incremental addition (1 func is added) that improves the LSV in general.

https://github.com/llvm/llvm-project/pull/114501