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

[Craig Topper via llvm-commits]

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@@ -113,9 +113,17 @@ struct ExtAddrMode {
 ///
 class LLVM_ABI TargetInstrInfo : public MCInstrInfo {
 protected:
+  /// Subtarget specific sub-array of MCInstrInfo's RegClassByHwModeTables
+  /// (i.e. the table for the active HwMode). This should be indexed by
+  /// MCOperandInfo's RegClass field for LookupRegClassByHwMode operands.
+  const int16_t *const RegClassByHwMode;
+
+public:
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topperc wrote:

Why did this constructor become public?

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