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

[Ming-Yi Lai via llvm-commits]

mylai-mtk wrote:

> The first three paragraphs are dense but probably not so clear. Can you replace that with: ...

Your words explains the expected behavior of LLD, but does not explain the intention/meaning of that behavior, so I adapted it to be included in the PR message (the to-be commit msg) and chose to also keep my old msgs. Hope you like it. Note that the force flags. e.g. `-z zicfiss=always`, are not implemented by this PR, so I removed the relevant msgs.

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Update: Address comments.

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