6072e4006f
This PR preserve leading dimension during blocking. This ensures the blocking process avoid generating unnecessary insert/extract_strided_slice, which under certain condition becomes difficult to be canceled, and creates extra burden in lane layout propagation and subgroup distribution. This PR also extended subgroup distribution so load and store can support payload/mask/offsets with leading unit dimension. The distributed load/store works on 1d only, but shapecast is inserted to remove and add the leading dimension for the input/output vectors. Comparing to the insert/extract inserted at subgroup level, the shapecast inserted at lane level handling leading unit dimension is essentially a nop and can be processed lightly.
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