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

[Craig Topper via cfe-commits]

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@@ -138,6 +150,8 @@ class RISCVSubtarget : public RISCVGenSubtargetInfo {
   /// initializeProperties().
   RISCVProcFamilyEnum getProcFamily() const { return RISCVProcFamily; }
 
+  RISCVProfileEnum getRISCVProfile() const { return RISCVProfile; }
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topperc wrote:

If we use the profile in the backend wouldn't that mean the profile gets 
different treatment than the equivalent list of extensions?

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