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

[Kito Cheng via llvm-commits]

kito-cheng wrote:

I would prefer use `zicfilp=` and `zicfiss=`, and it's my proposal for the option:
`-z zicfilp=force-unlabeled|force-func-sig|warning`, `-z zicfiss=force|warning` or 
`-z zicfilp=force-unlabeled|force-func-sig|report`, `-z zicfiss=force|report`?

`force|force-unlabeled|force-func-sig`: Force set corresponding GNU property.
`warning` or `report`: Report which object missing the GNU property.

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