Fix regressions triggered by map invalidation during graph creation.

src/assert-scope.h

 // Copyright 2013 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 23 matching lines @@
 namespace v8 {
 namespace internal {
 
 class Isolate;
 
 enum PerThreadAssertType {
   HEAP_ALLOCATION_ASSERT,
   HANDLE_ALLOCATION_ASSERT,
   HANDLE_DEREFERENCE_ASSERT,
   DEFERRED_HANDLE_DEREFERENCE_ASSERT,
+  CODE_DEPENDENCY_CHANGE_ASSERT,
   LAST_PER_THREAD_ASSERT_TYPE
 };
 
 
 #ifdef DEBUG
 class PerThreadAssertData {
  public:
   PerThreadAssertData() : nesting_level_(0) {
     for (int i = 0; i < LAST_PER_THREAD_ASSERT_TYPE; i++) {
       assert_states_[i] = true;
@@ skipping 109 matching lines @@
     AllowHandleDereference;
 
 // Scope to document where we do not expect deferred handles to be dereferenced.
 typedef PerThreadAssertScope<DEFERRED_HANDLE_DEREFERENCE_ASSERT, false>
     DisallowDeferredHandleDereference;
 
 // Scope to introduce an exception to DisallowDeferredHandleDereference.
 typedef PerThreadAssertScope<DEFERRED_HANDLE_DEREFERENCE_ASSERT, true>
     AllowDeferredHandleDereference;
 
+// Scope to document where we do not expect deferred handles to be dereferenced.
+typedef PerThreadAssertScope<CODE_DEPENDENCY_CHANGE_ASSERT, false>
+    DisallowCodeDependencyChange;
+
+// Scope to introduce an exception to DisallowDeferredHandleDereference.
+typedef PerThreadAssertScope<CODE_DEPENDENCY_CHANGE_ASSERT, true>
+    AllowCodeDependencyChange;
+
 } }  // namespace v8::internal
 
 #endif  // V8_ASSERT_SCOPE_H_