[Interpreter] Support for operator new.

src/x64/interface-descriptors-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 370 matching lines @@
       rbx   // type vector
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
 void InterpreterPushArgsAndCallDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rax,  // argument count (not including receiver)
-      rbx,  // address of first argument
-      rdi   // the target callable to be call
+      rbx,  // address of first argument.
+      rdi   // the constructor.

[rmcilroy, 2015/10/13 14:07:30]

I don't think this change was intended?

[oth, 2015/10/14 08:40:09]

Done. Darn!

   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
+
+
+void InterpreterPushArgsAndConstructDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      rax,  // argument count (not including receiver)
+      rdx,  // original constructor
+      rdi,  // constructor
+      rbx,  // address of first argument
+  };
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 
 
 void InterpreterCEntryDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rax,  // argument count (argc)
       r15,  // address of first argument (argv)
       rbx   // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64