[RISCV][Clang] Add more RVV Floating-Point intrinsic functions.

Support below instructions.
1. Vector Widening Floating-Point Add/Subtract Instructions
2. Vector Widening Floating-Point Multiply
3. Vector Single-Width Floating-Point Fused Multiply-Add Instructions
4. Vector Widening Floating-Point Fused Multiply-Add Instructions
5. Vector Floating-Point Compare Instructions

Reviewed By: craig.topper, HsiangKai

Authored-by: Roger Ferrer Ibanez <rofirrim@gmail.com>
Co-Authored-by: Zakk Chen <zakk.chen@sifive.com>

Differential Revision: https://reviews.llvm.org/D99669