s390: enable -march=z196 flag

gypfiles/toolchain.gypi

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 297 matching lines @@
         'conditions': [
           ['v8_target_arch=="s390x"', {
             'defines': [
               'V8_TARGET_ARCH_S390X',
             ],
           }],
           ['v8_host_byteorder=="little"', {
             'defines': [
               'V8_TARGET_ARCH_S390_LE_SIM',
             ],
+          }, {
+            'cflags': [ '-march=z196' ],
           }],
           ],
       }],  # s390
       ['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
         'defines': [
           'V8_TARGET_ARCH_PPC',
         ],
         'conditions': [
           ['v8_target_arch=="ppc64"', {
             'defines': [
@@ skipping 1083 matching lines @@
             ],
           },
           'Release_x64': {
             'inherit_from': ['ReleaseBase'],
           },
         }],
       ],
     },  # configurations
   },  # target_defaults
 }