[MLIR][OpenACC] Fix crash in verifyDeviceTypeCountMatch when deviceTypes is null (#186279) When an acc.parallel op has async operands (via operandSegmentSizes) but no corresponding asyncOperandsDeviceType attribute, the verifier called verifyDeviceTypeCountMatch with a null ArrayAttr. The function then dereferenced the null pointer via deviceTypes.getValue(), causing a segfault instead of a diagnostic. Fix by guarding the getValue() call with a null check. When deviceTypes is absent but operands are present, the mismatch is now reported as a proper verifier error. Fixes #107027 Assisted-by: Claude Code
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