Adjust x86 testsuite for recent if-conversion cost checking

gcc/testsuite
	PR testsuite/109549
	* gcc.target/i386/cmov6.c: No longer expect this test to
	generate 'cmov' instructions.

gcc/testsuite/gcc.target/i386/cmov6.c

@@ -1,6 +1,9 @@
 /* { dg-do compile } */
 /* { dg-options "-O2 -march=k8" } */
-/* { dg-final { scan-assembler "cmov\[^6\]" } } */
+/* if-converting this sequence would require two cmov
+   instructions and seems to always cost more independent
+   of the TUNE_ONE_IF_CONV setting.  */
+/* { dg-final { scan-assembler-not "cmov\[^6\]" } } */
 
 /* Verify that blocks are converted to conditional moves.  */
 extern int bar (int, int);