[llvm] CodeGen: Add RegisterClass by HwMode (PR #158269)

[Craig Topper via llvm-commits]

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@@ -133,6 +141,18 @@ class LLVM_ABI TargetInstrInfo : public MCInstrInfo {
            Opc <= TargetOpcode::GENERIC_ATOMICRMW_OP_END;
   }
 
+  /// Return the subtarget appropripate RegClassID for \p OpInfo
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topperc wrote:

```suggestion
  /// Returns the subtarget appropriate RegClassID for \p OpInfo
```

https://github.com/llvm/llvm-project/pull/158269