[llvm] [RISCV][MC] Implement ISA mapping symbols (PR #67541)

[Craig Topper via llvm-commits]

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@@ -44,14 +44,26 @@ RISCVTargetELFStreamer::RISCVTargetELFStreamer(MCStreamer &S,
   // its ParseInstruction may call setForceRelocs as well.
   if (STI.hasFeature(RISCV::FeatureRelax))
     static_cast<RISCVAsmBackend &>(MAB).setForceRelocs();
+
+  auto ParseResult = RISCVFeatures::parseFeatureBits(
+      STI.getTargetTriple().isRISCV64(), Features);
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topperc wrote:

I think you can use `STI.hasFeature(RISCV::Feature64Bit)`

https://github.com/llvm/llvm-project/pull/67541