Adjust more testcases for O2 vectorization enabling.

Adjust more testcases for O2 vectorization enabling.

libgomp/ChangeLog:

	* testsuite/libgomp.c++/scan-10.C: Add option -fvect-cost-model=cheap.
	* testsuite/libgomp.c++/scan-11.C: Ditto.
	* testsuite/libgomp.c++/scan-12.C: Ditto.
	* testsuite/libgomp.c++/scan-13.C: Ditto.
	* testsuite/libgomp.c++/scan-14.C: Ditto.
	* testsuite/libgomp.c++/scan-15.C: Ditto.
	* testsuite/libgomp.c++/scan-16.C: Ditto.
	* testsuite/libgomp.c++/scan-9.C: Ditto.
	* testsuite/libgomp.c-c++-common/lastprivate-conditional-7.c: Ditto.
	* testsuite/libgomp.c-c++-common/lastprivate-conditional-8.c: Ditto.
	* testsuite/libgomp.c/scan-11.c: Ditto.
	* testsuite/libgomp.c/scan-12.c: Ditto.
	* testsuite/libgomp.c/scan-13.c: Ditto.
	* testsuite/libgomp.c/scan-14.c: Ditto.
	* testsuite/libgomp.c/scan-15.c: Ditto.
	* testsuite/libgomp.c/scan-16.c: Ditto.
	* testsuite/libgomp.c/scan-17.c: Ditto.
	* testsuite/libgomp.c/scan-18.c: Ditto.
	* testsuite/libgomp.c/scan-19.c: Ditto.
	* testsuite/libgomp.c/scan-20.c: Ditto.
	* testsuite/libgomp.c/scan-21.c: Ditto.
	* testsuite/libgomp.c/scan-22.c: Ditto.

gcc/testsuite/ChangeLog:

	* g++.dg/tree-ssa/pr94403.C: Add -fno-tree-vectorize
	* gcc.dg/optimize-bswapsi-5.c: Ditto.
	* gcc.dg/optimize-bswapsi-6.c: Ditto.
	* gcc.dg/Warray-bounds-51.c: Add additional option
	-mtune=generic for target x86/i?86
	* gcc.dg/Wstringop-overflow-14.c: Ditto.