gdb/testsuite/

gdb/testsuite/
	Support processors without SSSE3.
	* gdb.reverse/i386-sse-reverse.c (sse_test): Move pabsb, pabsw and
	pabsd into ...
	(ssse3_test): ... a new function.
	(main): Call ssse3_test.
	* gdb.reverse/i386-sse-reverse.exp: New variable end_ssse3_test.
	Update expected values everywhere.
	(reverse-step to pabsd, verify xmm0 after reverse pabsd)
	(verify xmm1 after reverse pabsd, verify xmm2 after reverse pabsd)
	(reverse-step to pabsw, verify xmm0 after reverse pabsw)
	(verify xmm1 after reverse pabsw, verify xmm2 after reverse pabsw)
	(reverse-step to pabsb, verify xmm0 after reverse pabsb)
	(verify xmm1 after reverse pabsb, verify xmm2 after reverse pabsb):
	Move these tests lower.
	(set breakpoint at end of ssse3_test, continue to end of ssse3_test)
	(verify xmm0 at end of ssse3_test, verify xmm1 at end of ssse3_test)
	(verify xmm2 at end of ssse3_test, continue to end of ssse3_test #2):
	New tests.