S/390: Enable 64 bit atomic tests with -m31 -mzarch.

gcc/testsuite/ChangeLog:

2015-12-02  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* lib/target-supports.exp: Add s390 and s390x to the list of long
	long atomic targets.

From-SVN: r231151

gcc/testsuite/ChangeLog

 2015-12-02  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
+	* lib/target-supports.exp: Add s390 and s390x to the list of long
+	long atomic targets.
+
+2015-12-02  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
 	* gcc.dg/optimize-bswapdi-1.c: Force using -mzarch on s390 and
 	s390x to enable 64 bit bswap patterns.
 	* gcc.dg/optimize-bswapdi-2.c: Likewise.

gcc/testsuite/lib/target-supports.exp

@@ -5404,6 +5404,7 @@ proc check_effective_target_sync_int_128_runtime { } {
 # Return 1 if the target supports atomic operations on "long long".
 #
 # Note: 32bit x86 targets require -march=pentium in dg-options.
+# Note: 32bit s390 targets require -mzarch in dg-options.
 
 proc check_effective_target_sync_long_long { } {
     if { [istarget x86_64-*-*] || [istarget i?86-*-*])
@@ -5411,6 +5412,7 @@ proc check_effective_target_sync_long_long { } {
 	 || [istarget arm*-*-*]
 	 || [istarget alpha*-*-*]
 	 || ([istarget sparc*-*-*] && [check_effective_target_lp64])
+	 || [istarget s390*-*-*]
 	 || [istarget spu-*-*] } {
 	return 1
     } else {