As per the docs [1]: ``` In absence of an explicit layout, a memref is considered to have a multi-dimensional identity affine map layout. ``` This patch makes sure that MemRefs with no strides (i.e. no explicit layout) are treated as contiguous when checking whether a particular vector is a contiguous slice of the given MemRef. [1] https://mlir.llvm.org/docs/Dialects/Builtin/#layout Follow-up for #76428.