[flang][openacc] Prevent SimplifyArrayCoorOp from folding rebox used by ACC data entry ops (#187616) The SimplifyArrayCoorOp canonicalization pattern folds fir.rebox into fir.array_coor by replacing the rebox result with its source. When the rebox result is the variable of an acc.copyin (or other data entry op), this folding breaks the chain that LegalizeDataValuesInRegion relies on to replace host values with device pointers inside compute regions. With default(none), ACCImplicitData cannot recover the mapping, leaving the rebox source as an illegal live-in in the offload region. This is causing illegal live-ins at higher optimization levels. Guard the folding so it bails out when any user of the rebox is an ACC_DATA_ENTRY_OPS.
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