testsuite: Fix up pr94482.c testcase [PR94482]

The test FAILs on powerpc64-linux with -m32 due to psabi warnings.
Furthermore, the test needs really -msse2 to reproduce on x86 -m32 at -O2.

2020-04-11  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/94482
	* gcc.dg/torture/pr94482.c: Add -Wno-psabi -w.  Don't add -msse
	and sse_runtime effective target on x86, instead only add -msse2
	if target is sse2_runtime.

gcc/testsuite/ChangeLog

+2020-04-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/94482
+	* gcc.dg/torture/pr94482.c: Add -Wno-psabi -w.  Don't add -msse
+	and sse_runtime effective target on x86, instead only add -msse2
+	if target is sse2_runtime.
+
 2020-04-10  Iain Sandoe  <iain@sandoe.co.uk>
 
 	PR c++/94528

gcc/testsuite/gcc.dg/torture/pr94482.c

 /* { dg-do run } */
-/* { dg-options "-msse" { target { i?86-*-* x86_64-*-* } } } */
-/* { dg-require-effective-target sse_runtime { target { i?86-*-* x86_64-*-* } } } */
+/* { dg-additional-options "-Wno-psabi -w" } */
+/* { dg-additional-options "-msse2" { target sse2_runtime } } */
 
 typedef unsigned V __attribute__ ((__vector_size__ (16)));
 union U