[llvm] [RISCV][GlobalISel] Select G_FRAME_INDEX (PR #68254)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave approved this pull request.

LGTM. Please consider pushing new commit instead of forced push (unless it's to rebase on critical fixes) though.

https://github.com/llvm/llvm-project/pull/68254