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[memref] Handle edge case in subview of full static size fold (llvm#1…
…05635) It is possible to have a subview with a fully static size and a type that matches the source type, but a dynamic offset that may be different. However, currently the memref dialect folds: ```mlir func.func @subview_of_static_full_size( %arg0: memref<16x4xf32, strided<[4, 1], offset: ?>>, %idx: index) -> memref<16x4xf32, strided<[4, 1], offset: ?>> { %0 = memref.subview %arg0[%idx, 0][16, 4][1, 1] : memref<16x4xf32, strided<[4, 1], offset: ?>> to memref<16x4xf32, strided<[4, 1], offset: ?>> return %0 : memref<16x4xf32, strided<[4, 1], offset: ?>> } ``` To: ```mlir func.func @subview_of_static_full_size( %arg0: memref<16x4xf32, strided<[4, 1], offset: ?>>, %arg1: index) -> memref<16x4xf32, strided<[4, 1], offset: ?>> { return %arg0 : memref<16x4xf32, strided<[4, 1], offset: ?>> } ``` Which drops the dynamic offset from the `subview` op.
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