[PATCH][AArch64][Testsuite] Fix gcc.target/aarch64/c-output-template-3.c

[Alan Lawrence <alan.lawrence@arm.com>]

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Following Richard Biener's patch at 
https://gcc.gnu.org/ml/gcc-patches/2015-03/msg01064.html (r221532), 
gcc.target/aarch64/c-output-template-3.c fails with:

c-output-template-3.c: In function 'test':
c-output-template-3.c:7:5: error: impossible constraint in 'asm'
      __asm__ ("@ %c0" : : "S" (&test + 4));

This patch fixes the test by changing options to -O in a similar manner to 
Richard's fixes to gcc.dg/pr15347.c and c-c++-common/pr19807-1.c.

Ok for trunk?

Cheers, Alan

gcc/testsuite/ChangeLog:

	gcc.target/aarch64/c-output-template.c: Add -O, remove
	-Wno-pointer-arith.

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diff --git a/gcc/testsuite/gcc.target/aarch64/c-output-template-3.c b/gcc/testsu
index c28837c..8bde4cb 100644
--- a/gcc/testsuite/gcc.target/aarch64/c-output-template-3.c
+++ b/gcc/testsuite/gcc.target/aarch64/c-output-template-3.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-Wno-pointer-arith" } */
+/* { dg-options "-O" } */
 
 void
 test (void)