[mlir][acc] Support lazy remark message construction (#180665) The OpenACC remark emission utilities previously only accepted Twine for message construction. However, complex remarks often require additional logic to build messages, such as resolving variable names. This results in unnecessary work when remarks are disabled. Add an overload that accepts a lambda for message generation, which is only invoked when remark emission is enabled. Update ACCLoopTiling to use this lazy API for tile size reporting. Additionally, getVariableName now returns numeric strings for constant integer values. This is also being used by ACCLoopTiling along with the lazy remark update.
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