[ast] Never declare non-lexical variables as kNeedsInitialization.

src/ast/scopes.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/ast/scopes.h"
 
 #include <set>
 
 #include "src/accessors.h"
 #include "src/bootstrapper.h"
@@ skipping 1231 matching lines @@
 }
 #endif  // DEBUG
 
 
 Variable* Scope::NonLocal(const AstRawString* name, VariableMode mode) {
   if (dynamics_ == NULL) dynamics_ = new (zone()) DynamicScopePart(zone());
   VariableMap* map = dynamics_->GetMap(mode);
   Variable* var = map->Lookup(name);
   if (var == NULL) {
     // Declare a new non-local.
-    InitializationFlag init_flag = (mode == VAR)
-        ? kCreatedInitialized : kNeedsInitialization;
-    var = map->Declare(zone(), NULL, name, mode, Variable::NORMAL, init_flag);
+    DCHECK(!IsLexicalVariableMode(mode));
+    var = map->Declare(zone(), NULL, name, mode, Variable::NORMAL,
+                       kCreatedInitialized);
     // Allocate it by giving it a dynamic lookup.
     var->AllocateTo(VariableLocation::LOOKUP, -1);
   }
   return var;
 }
 
 Variable* Scope::LookupRecursive(VariableProxy* proxy,
                                  BindingKind* binding_kind,
                                  AstNodeFactory* factory,
                                  Scope* outer_scope_end) {
@@ skipping 522 matching lines @@
       function != nullptr && function->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() -
          (is_function_var_in_context ? 1 : 0);
 }
 
 
 int Scope::ContextGlobalCount() const { return num_global_slots(); }
 
 }  // namespace internal
 }  // namespace v8