[llvm] [TableGen][NFC] Replace hardcoded opcode numbering. (PR #81065)

[Jason Eckhardt via llvm-commits]

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@@ -1399,9 +1399,8 @@ void InstructionOpcodeMatcher::initOpcodeValuesMap(
     const CodeGenTarget &Target) {
   OpcodeValues.clear();
 
-  unsigned OpcodeValue = 0;
   for (const CodeGenInstruction *I : Target.getInstructionsByEnumValue())
-    OpcodeValues[I] = OpcodeValue++;
+    OpcodeValues[I] = Target.getInstrIntValue(I->TheDef);
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nvjle wrote:

> Is this map a candidate for deletion now? It looks like it might be redundant with the new map?

At first glance it does appear so, but I'm not entirely sure-- I'll need to look more carefully as a follow-up task (i.e., on better sleep).

https://github.com/llvm/llvm-project/pull/81065