testsuite: Add -Wpsabi to gcc.dg/torture/pr93170.c [PR93460]

2020-01-28  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	PR testsuite/93460
	* gcc.dg/torture/pr93170.c: Add -Wpsabi.

gcc/testsuite/ChangeLog

+2020-01-28  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR testsuite/93460
+	* gcc.dg/torture/pr93170.c: Add -Wpsabi.
+
 2020-01-28  Martin Liska  <mliska@suse.cz>
 
 	PR c++/92440

gcc/testsuite/gcc.dg/torture/pr93170.c

 /* { dg-do run } */
 /* { dg-require-effective-target int128 } */
+/* { dg-options "-Wno-psabi" } */
 /* { dg-additional-options "-frename-registers -fno-tree-forwprop -fno-tree-fre -fira-algorithm=priority -mstringop-strategy=loop --param=hot-bb-frequency-fraction=0 -Wno-psabi" { target { x86_64-*-* i?86-*-* } } } */
 
 typedef unsigned char v64u8 __attribute__ ((vector_size (64)));