[llvm] [RISCV] Remove codegen for trivial VP intrinsics (PR #179622)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave commented:

> ExpandVectorPredication was missing a few FP intrinsics, so this PR also handles them in CachingVPExpander::expandPredication.

Do we need to add some tests for these newly supported intrinsics?

https://github.com/llvm/llvm-project/pull/179622