[flang][FIRToMemRef] Non-box complex slices use shapeVec strides, not `fir.box_dims` (#200285) FIRToMemRef now lowers `fir.array_coor` on projected complex %re / %im when the base is a contiguous `!fir.ref` with `fir.shape` (e.g. a static component array in a derived type), without calling `fir.box_dims` on the ref and with strides that match the memref<…×2×T> view. Previously, any projected slice is lowered through the descriptor path and produced invalid `fir.box_dims` on a ref. Fixed to take descriptor strides only when the coor base is actually a box. For ref + shape, it keeps the synthesized row-major layout and scales array strides by two scalar slots per complex, with a re/im dimension (extent 2, stride 1).
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