s390: enable march=z196

PR-URL: #11730
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Junliang Yan

common.gypi

@@ -315,12 +315,12 @@
 	    'ldflags': [ '-m64' ],
 	   }],
           [ 'target_arch=="s390"', {
-            'cflags': [ '-m31' ],
-            'ldflags': [ '-m31' ],
+            'cflags': [ '-m31', '-march=z196' ],
+            'ldflags': [ '-m31', '-march=z196' ],
           }],
           [ 'target_arch=="s390x"', {
-            'cflags': [ '-m64' ],
-            'ldflags': [ '-m64' ],
+            'cflags': [ '-m64', '-march=z196' ],
+            'ldflags': [ '-m64', '-march=z196' ],
           }],
           [ 'OS=="solaris"', {
             'cflags': [ '-pthreads' ],