Reland: [modules] Properly initialize declared variables.

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/ast/ast.h"
@@ skipping 134 matching lines @@
       function_kind_(function_kind),
       params_(4, zone),
       sloppy_block_function_map_(zone) {
   DCHECK_NE(scope_type, SCRIPT_SCOPE);
   SetDefaults();
   asm_function_ = outer_scope_->IsAsmModule();
 }
 
 ModuleScope::ModuleScope(DeclarationScope* script_scope,
                          AstValueFactory* ast_value_factory)
-    : DeclarationScope(ast_value_factory->zone(), script_scope, MODULE_SCOPE) {
+    : DeclarationScope(ast_value_factory->zone(), script_scope, MODULE_SCOPE,
+                       kModule) {
   Zone* zone = ast_value_factory->zone();
   module_descriptor_ = new (zone) ModuleDescriptor(zone);
   set_language_mode(STRICT);
   DeclareThis(ast_value_factory);
 }
 
 ModuleScope::ModuleScope(Isolate* isolate, Handle<ScopeInfo> scope_info,
                          AstValueFactory* avfactory)
     : DeclarationScope(avfactory->zone(), MODULE_SCOPE, scope_info) {
   Zone* zone = avfactory->zone();
@@ skipping 1728 matching lines @@
   Variable* function =
       is_function_scope() ? AsDeclarationScope()->function_var() : nullptr;
   bool is_function_var_in_context =
       function != nullptr && function->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
          (is_function_var_in_context ? 1 : 0);
 }
 
 }  // namespace internal
 }  // namespace v8