[RISCV] Simplify tracking of tracking and encoding of push/pop in RISCVFrameLowering. NFC#129343

topperc merged 3 commits intollvm:mainllvm/llvm-project:mainfrom

topperc:pr/simplify-push-pop-frametopperc/llvm-project:pr/simplify-push-pop-frameCopy head branch name to clipboard