[llvm] [RISCV] Deduplicate frame base address materializations for large stack frames (PR #211748)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

Please don't force push the commit. Instead, please commit your changes separately so that reviewers can see the differences.

You need to change the PR's description as well.

https://github.com/llvm/llvm-project/pull/211748