Fix this FAIL:
FAIL: gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c scan-tree-dump-times vect "Maximum lmul = 2" 1
gcc/testsuite/ChangeLog:
* gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c: Adapt test.
/* { dg-final { scan-assembler-times {ret} 2 } } *
/* { dg-final { scan-tree-dump-times "Maximum lmul = 8" 1 "vect" } } */
/* { dg-final { scan-tree-dump-times "Maximum lmul = 4" 1 "vect" } } */
-/* { dg-final { scan-tree-dump-times "Maximum lmul = 2" 1 "vect" } } */
+/* { dg-final { scan-tree-dump "Maximum lmul = 2" "vect" } } */
/* { dg-final { scan-tree-dump-not "Maximum lmul = 1" "vect" } } */