[stubs] Introduce a dedicated FastNewObjectStub.

src/arm64/interface-descriptors-arm64.cc

 // Copyright 2012 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.
 
 #include "src/arm64/interface-descriptors-arm64.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/interface-descriptors.h"
 
@@ skipping 66 matching lines @@
 }
 
 
 void FastNewContextDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // x1: function
   Register registers[] = {x1};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void FastNewObjectDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {x1, x3};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 
 void FastNewRestParameterDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // x1: function
   Register registers[] = {x1};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
 void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
@@ skipping 413 matching lines @@
       x1    // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64