[llvm-branch-commits] [RISCV] Port RISCVQCRelaxMarking to NewPM (PR #235253)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/235253

Standard NewPM pass porting. Also mark the CFG as preserved in the
LegacyPM.