At the moment the logic to tile and vectorize `linalg.matmul` is duplicated in multiple test files: * matmul.mlir * matmul_mixed_ty.mlir Instead, this patch uses `transform.foreach` to apply the same sequence to multiple functions within the same test file (e.g. `matmul_f32` and `matmul_mixed_ty` as defined in the original files). This allows us to merge relevant test files.