[llvm] Reland [RISCV] Prefer SP over FP for frame index access when offset fits within compressed immediate range. (PR #201541)

[Garvit Gupta via llvm-commits]

quic-garvgupt wrote:

@lenary @topperc can you pls approve the PR if everything looks good?

https://github.com/llvm/llvm-project/pull/201541