Disallow subclassing Arrays.

src/mips/full-codegen-mips.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_MIPS
 
 // Note on Mips implementation:
 //
@@ skipping 4214 matching lines @@
     __ lw(a3, MemOperand(a2));
     __ Push(a3);
     __ Addu(a1, a1, Operand(-1));
     __ Branch(&loop, ne, a1, Operand(zero_reg));
   }
 
   __ bind(&args_set_up);
   __ sll(at, a0, kPointerSizeLog2);
   __ Addu(at, at, Operand(sp));
   __ lw(a1, MemOperand(at, 0));
+  __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
 
   CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
   __ Drop(1);
 
   context()->Plug(result_register());
 }
 
 
@@ skipping 1198 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS