silence expected psabi warning in ipa-sra-19 on ppc-vxworks

The default CPU for our ppc-vx7r2 toolchain has no support for altivec
or vsx, so an ABI without vector support is selected.  The selected
calling conventions do not cover passing or returning vector types, so
-Wpsabi warns about such uses.

powerpc-ibm-aix* already silences these warnings with -Wno-psabi;
this patch extends that to powerpc-wrs-vxworks* too.


for  gcc/testsuite/ChangeLog

	* gcc.dg/ipa/ipa-sra-19.c: Extend -Wno-psabi to ppc-vx7r2.

gcc/testsuite/gcc.dg/ipa/ipa-sra-19.c

@@ -1,7 +1,7 @@
 /* { dg-do compile } */
 /* { dg-options "-O2"  } */
 /* { dg-additional-options "-msse2" { target ia32 } } */
-/* { dg-additional-options "-Wno-psabi" { target powerpc-ibm-aix* } } */
+/* { dg-additional-options "-Wno-psabi" { target powerpc-ibm-aix* powerpc-wrs-vxworks* } } */
 
 typedef int __attribute__((__vector_size__(16))) vectype;