[llvm] [RISCV][GISel] Add support for G_FCMP with F and D extensions. (PR #70624)

[Min-Yih Hsu via llvm-commits]

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

LGTM w/ minor comments.

I'm fine with keeping `legalizeFCmpPredicate` for now, as long as it will eventually be replaced by LegalizeHelper.

https://github.com/llvm/llvm-project/pull/70624