RISC-V Regression: Make pattern match more accurate of vect-live-2.c

Like previous patch:
https://gcc.gnu.org/pipermail/gcc-patches/2023-October/632400.html
https://patchwork.sourceware.org/project/gcc/patch/dde89b9e-49a0-d70b-0906-fb3022cac11b@gmail.com/

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/vect-live-2.c: Make pattern match more accurate.

gcc/testsuite/gcc.dg/vect/vect-live-2.c

@@ -58,4 +58,4 @@ main (void)
 }
 
 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
-/* { dg-final { scan-tree-dump-times "vec_stmt_relevant_p: stmt live but not relevant" 1 "vect" } } */
+/* { dg-final { scan-tree-dump-times "vec_stmt_relevant_p: stmt live but not relevant(?:(?!failed)(?!Re-trying).)*succeeded" 1 "vect" } } */