[clang] [lld] [llvm] [RISCV] Support .note.gnu.property for enable Zicfiss and Zicfilp extension (PR #77414)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Unless `lld/test/ELF` tests will get a failure, the `lld/` part should ideally be dropped from this PR.
lld folks (like I) might not notice this patch if there is just a `[RISCV]` tag.

https://github.com/llvm/llvm-project/pull/77414