[LLVM][TableGen] Use integers instead of string in CodeEmitterGen CaseMap (#172885) CodeEmitterGen CaseMap values is always a vector of integer IDs (HwMode or instruction opcode). So change the map values to be a vector of integers instead of strings and instead print the string form when emitting the case statements. This will help reduce the memory footprint by not storing potentially long strings (for opcode names) in the map.
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