Do not check if SMS succeeds on powerpc

Do not check if SMS succeeds on powerpc

These tests have become unstable and SMS either succeeds or doesn't
depending on things like changes in instruction latency. Removing
the scan-rtl-dump-times checks for powerpc*-*-*.

gcc/testsuite

	* gcc.dg/sms-1.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-2.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-3.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-4.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-6.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-8.c: Remove scan-rtl-dump-times check.
	* gcc.dg/sms-10.c: Remove scan-rtl-dump-times check.