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

[Fangrui Song via llvm-commits]

https://github.com/MaskRay requested changes to this pull request.

Request changes in case this lands before I reviewed. It may take some time.

Can you change the description to link to the psABI change?

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Q: what is GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_FUNC_SIG?

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