S390: Introduce a code stub version of Array.prototype.push

src/s390/interface-descriptors-s390.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 232 matching lines @@
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 void InternalArrayConstructorDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // stack param count needs (constructor pointer, and single argument)
   Register registers[] = {r3, r2};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void FastArrayPushDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // stack param count needs (arg count)
+  Register registers[] = {r2};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void CompareDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r3, r2};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 void BinaryOpDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r3, r2};
   data->InitializePlatformSpecific(arraysize(registers), registers);
@@ skipping 94 matching lines @@
       r4,  // address of first argument (argv)
       r3   // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390