[llvm] [TableGen][DecoderEmitter] Move Operands to InstructionEncoding (NFCI) (PR #154456)

[Rahul Joshi via llvm-commits]

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@@ -1950,21 +1959,13 @@ static void addOneOperandFields(const Record *EncodingDef, const BitsInit &Bits,
   }
 }
 
-static unsigned populateInstruction(
-    const CodeGenTarget &Target, const Record *EncodingDef,
-    const CodeGenInstruction *Inst, unsigned EncodingID,
-    std::map<unsigned, std::vector<OperandInfo>> &EncodingOperands,
-    bool IsVarLenInst) {
+unsigned InstructionEncoding::populateEncoding() {
+  bool IsVarLenInst = isa<DagInit>(EncodingDef->getValueInit("Inst"));
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jurahul wrote:

This seems reasonable. For M68k, I am assuming all insts have DAG for Inst, so they will all get this flag as true.

https://github.com/llvm/llvm-project/pull/154456