[clang] [llvm] [clang][RISCV] Introduce CodeGenModule::calcRISCVZicfilpFuncSigLabel() (PR #111661)

[Ming-Yi Lai via llvm-commits]

mylai-mtk wrote:

Update:

* Rebase to `main`
* Address comments: Expand the scope of this PR to allow testing
* Address other comments

https://github.com/llvm/llvm-project/pull/111661