Fix parallel recompilation wrt initial object/array map dependency.

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 384 matching lines @@
 
   void MarkRecursive() {
     is_recursive_ = true;
   }
 
   bool is_recursive() const {
     return is_recursive_;
   }
 
   void MarkDependsOnEmptyArrayProtoElements() {
+    // Add map dependency if not already added.
+    if (depends_on_empty_array_proto_elements_) return;
+    isolate()->initial_object_prototype()->map()->AddDependentCompilationInfo(
+        DependentCode::kElementsCantBeAddedGroup, info());
+    isolate()->initial_array_prototype()->map()->AddDependentCompilationInfo(
+        DependentCode::kElementsCantBeAddedGroup, info());
     depends_on_empty_array_proto_elements_ = true;
   }
 
-  bool depends_on_empty_array_proto_elements() {
-    return depends_on_empty_array_proto_elements_;
-  }
-
   void RecordUint32Instruction(HInstruction* instr) {
     if (uint32_instructions_ == NULL) {
       uint32_instructions_ = new(zone()) ZoneList<HInstruction*>(4, zone());
     }
     uint32_instructions_->Add(instr, zone());
   }
 
  private:
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
                          int32_t integer_value);
@@ skipping 1600 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_