Fix fast array literals to ignore prototype chain.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 34bdef069ef33b867dd822a8ee017d3c5af6bbdf..c56188bb37602aff466ba5aded4f1c0ce5665bb6 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4555,9 +4555,10 @@ void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
         __ sw(a2, FieldMemOperand(result, total_offset + 4));
       }
     } else if (elements->IsFixedArray()) {
+      Handle<FixedArray> fast_elements = Handle<FixedArray>::cast(elements);
       for (int i = 0; i < elements_length; i++) {
         int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
-        Handle<Object> value = JSObject::GetElement(object, i);
+        Handle<Object> value(fast_elements->get(i));
         if (value->IsJSObject()) {
           Handle<JSObject> value_object = Handle<JSObject>::cast(value);
           __ Addu(a2, result, Operand(*offset));