[clang] [clang][RISC-V] fixed fp calling convention for fpcc eligible structs for risc-v (PR #110690)

[Kamran Yousafzai via cfe-commits]

KamranYousafzai wrote:

Hi @asb @topperc , do you think we can merge it?

https://github.com/llvm/llvm-project/pull/110690