[clang] [llvm] [RISCV] Support RISC-V Profiles in -march option (PR #76357)

[Brandon Wu via cfe-commits]

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@@ -36,6 +36,11 @@ struct RISCVSupportedExtension {
   }
 };
 
+struct RISCVProfile {
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4vtomat wrote:

Very minor too, if you use std::pair, could you add the comments describing what the fields represent?

https://github.com/llvm/llvm-project/pull/76357