ix86: pass correct options to compiler for gfni-4 testcase

SSE2 is the required prereq of the builtins; as x86-64 has SSE2 enabled
anyway, the test failure was noticable on 32-bit builds only.

From-SVN: r272743

gcc/testsuite/ChangeLog

+2019-06-27  Jan Beulich  <jbeulich@suse.com>
+
+	* gcc.target/i386/gfni-4.c: Pass -msse2.
+
 2019-06-27  Richard Biener  <rguenther@suse.de>
 
 	* gcc.dg/tree-ssa/ssa-fre-69.c: New testcase.

gcc/testsuite/gcc.target/i386/gfni-4.c

 /* { dg-do compile } */
-/* { dg-options "-mgfni -O2 -msse" } */
+/* { dg-options "-mgfni -O2 -msse2" } */
 /* { dg-final { scan-assembler-times "gf2p8affineinvqb\[ \\t\]+\[^\{\n\]*\\\$3\[^\n\r]*%xmm\[0-9\]+\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
 /* { dg-final { scan-assembler-times "gf2p8affineqb\[ \\t\]+\[^\{\n\]*\\\$3\[^\n\r]*%xmm\[0-9\]+\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
 /* { dg-final { scan-assembler-times "gf2p8mulb\[ \\t\]+\[^\{\n\]*%xmm\[0-9\]+\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */