When failing using forced SLP we do not print the non-SLP failure
mode which reads slightly different. Massage the expectation a bit.
* gcc.dg/vect/pr65947-8.c: Adjust.
/* { dg-final { scan-tree-dump-not "LOOP VECTORIZED" "vect" { target { ! { vect_fold_extract_last } } } } } */
/* { dg-final { scan-tree-dump "LOOP VECTORIZED" "vect" { target { vect_fold_extract_last } } } } */
-/* { dg-final { scan-tree-dump "multiple types in double reduction or condition reduction" "vect" { target { ! { vect_fold_extract_last } } } } } */
+/* { dg-final { scan-tree-dump "multiple types in\[^\\n\\r\]* condition reduction" "vect" { target { ! { vect_fold_extract_last } } } } } */