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

[Fangrui Song via cfe-commits]

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@@ -0,0 +1,29 @@
+// When -march with zicfiss0p4 or zicfilp0p4 add GNU property to file object
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MaskRay wrote:

This directory is for driver tests. Codegen tests should use `%clang_cc1` and be moved elsewhere (e.g. test/CodeGen)

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