[mlir][acc] Fix async only api on data entry operations (#122818) Data entry operations which are created from constructs with async clause that has no value (aka `acc data copyin(var) async`) end up holding an attribute array named to keep track of this information. However, in cases where `async` clause is not used, calling `hasAsyncOnly` ends up crashing since this attribute is not set. Thus, to fix this issue, ensure that we check for this attribute before trying to walk the attribute array.
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