[llvm-branch-commits] [RISCV] Port LoadStoreOpt to NewPM (PR #235511)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/235511

Standard NewPM pass portign. Also mark in the LegacyPM this pass
preserves the CFG.