[lld] [LLD][ELF][RISCV] Handle .note.gnu.property sections for Zicfilp/Zicfiss features (PR #127193)

[Ming-Yi Lai via llvm-commits]

mylai-mtk wrote:

Hi MaskRay, thanks for the comments. I've gone through the comments in https://github.com/llvm/llvm-project/pull/90732 and applied those related to coding style to this patch. There are some other comments around the (force) GCS flag. Since this patch does not include an equivalent of the force flag, I'd just ignore them for now, but with this chance I would like to take this toolchain convention issue to a stakeholder @kito-cheng :

Should we follow the Intel style (-z force-zicfilp=, -z force-zicfiss), or use the AArch64 style (-z zicfilp=, -z zicfiss) for the force flag? 
(I'm good with both options.)

Thanks!

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Updates: Address comments, beautify tests

https://github.com/llvm/llvm-project/pull/127193