[AArch64][test] Fix FAIL: gcc.target/aarch64/store-pair-1.c scan-assembler stp\tw[0-9]+, w[0-9]+

	* gcc.target/aarch64/store-pair-1.c: Update scan-assembler to check
	for wzr reg.

From-SVN: r220176

gcc/testsuite/ChangeLog

+2015-01-27  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* gcc.target/aarch64/store-pair-1.c: Update scan-assembler to check
+	for wzr reg.
+
 2015-01-27  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* gcc/testsuite/gcc.target/s390/hotpatch-13.c: New testcase.

gcc/testsuite/gcc.target/aarch64/store-pair-1.c

@@ -9,4 +9,4 @@ int f(int *a, int b)
 }
 
 /* We should be able to produce store pair for the store of 28/29 store. */
-/* { dg-final { scan-assembler "stp\tw\[0-9\]+, w\[0-9\]+" } } */
+/* { dg-final { scan-assembler "stp\tw(\[0-9\]+)\|(zr), w\[0-9\]+" } } */