Disallow subclassing Arrays.

src/x64/full-codegen-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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 4099 matching lines @@
     Label loop;
     __ bind(&loop);
     __ Push(Operand(rdx, -1 * kPointerSize));
     __ subp(rdx, Immediate(kPointerSize));
     __ decp(rcx);
     __ j(not_zero, &loop);
   }
 
   __ bind(&args_set_up);
   __ movp(rdi, Operand(rsp, rax, times_pointer_size, 0));
+  __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
 
   CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
   __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
   __ Drop(1);
 
   context()->Plug(result_register());
 }
 
 
@@ skipping 1255 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64