Remove bogus test line from vect-over-widen-23.c

I'd cut-&-paste vect-over-widen-23.c in an attempt to get the target
reuirements right, but by doing so carried over an unwanted test for
shifts.

2018-12-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	* gcc.dg/vect/vect-over-widen-23.c: Remove unwanted line.

From-SVN: r266861

gcc/testsuite/ChangeLog

+2018-12-06  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* gcc.dg/vect/vect-over-widen-23.c: Remove unwanted line.
+
 2018-12-06  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* c-c++-common/torture/asm-inline.c: New testcase.

gcc/testsuite/gcc.dg/vect/vect-over-widen-23.c

@@ -25,7 +25,6 @@ foo ()
     }
 }
 
-/* { dg-final { scan-tree-dump-times "vect_recog_widen_shift_pattern: detected" 2 "vect" { target vect_widen_shift } } } */
 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+} "vect" } } */
 /* { dg-final { scan-tree-dump {VIEW_CONVERT_EXPR<vector[^ ]* unsigned} "vect" } } */
 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */