Fix parallel recompilation wrt initial object/array map dependency.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 00cd9be36aebe3097daae4635bd86abe9579b7cb..eb6473aca6fb3a7efa7ecc554498a10fb8f9de5d 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -402,13 +402,15 @@ class HGraph: public ZoneObject {
   }
 
   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());