[memref] Handle edge case in subview of full static size fold (#105635)

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.

0 files changed, 0 insertions, 0 deletions