[llvm] [RISCV][GISel] Add ZFA FP legalization and full tests for 9 insn (PR #118723)

[Luke Quinn via llvm-commits]

lquinn2015 wrote:

@topperc  - I updated the legalizer check i did not include the ZFA extension in the Sweep. Rather I added the alias opcode. Let me know if that makes sense. If we add the extension it passes the extra rules as "Oks" 

https://github.com/llvm/llvm-project/pull/118723