[llvm] [TableGen][DecoderEmitter] Add option to emit type-specialized `decodeToMCInst` (PR #146593)

[Sergei Barannikov via llvm-commits]

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@@ -2603,7 +2755,7 @@ namespace {
       OpcMap;
   std::map<unsigned, std::vector<OperandInfo>> Operands;
   std::vector<unsigned> InstrLen;
-  bool IsVarLenInst = Target.hasVariableLengthEncodings();
+  const bool IsVarLenInst = Target.hasVariableLengthEncodings();
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s-barannikov wrote:

We don't usually use `const` with non-pointers. Unrelated change anyway.

https://github.com/llvm/llvm-project/pull/146593