[flang] Optimize redundant array repacking. (#147881) This patch allows optimizing redundant array repacking, when the source array is statically known to be contiguous. This is part of the implementation plan for the array repacking feature, though, it does not affect any real life use case as long as FIR inlining is not a thing. I experimented with simple cases of FIR inling using `-inline-all`, and I recorded these cases in optimize-array-repacking.fir tests.
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