The TBAA generation gives conservative TBAA metadata when handling an
access of a record type with a descriptor member, since the access may
be a regular data access OR another descriptor. Array members were being
incorrectly identified as non-descriptor-members, and were giving
incorrect TBAA metadata which led to bugs showing up in the optimizer
when LLVM encountered mismatching TBAA.
`fir::isRecordWithDescriptorMember` now unwraps sequence types before
checking for descriptor members.
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