[flang][FIRToMemRef] Fix lowering of complex array component slices (z%re, z%im) (#191846) fir.slice with a path component (z%re, z%im) was silently dropped by FIRToMemRef. Since memref.reinterpret_cast cannot change element type, layout must come from the projected box descriptor via fir.box_dims/fir.box_elesize rather than the triplets. Only complex-array projections are handled here — sizeof(complex<T>)/sizeof(T) = 2 is always exact for divsi. Derived-type component projections bail out to downstream FIR-to-LLVM lowering where strides can be non-integer.
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