Revert of Always deserialize scope infos for parsing

src/ast/scopes.h

 // 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.
 
 #ifndef V8_AST_SCOPES_H_
 #define V8_AST_SCOPES_H_
 
 #include "src/ast/ast.h"
 #include "src/base/hashmap.h"
 #include "src/globals.h"
@@ skipping 106 matching lines @@
   // to the passed-in scope.
   void PropagateUsageFlagsToScope(Scope* other);
 
   Zone* zone() const { return zone_; }
 
   // ---------------------------------------------------------------------------
   // Declarations
 
   // Lookup a variable in this scope. Returns the variable or NULL if not found.
   Variable* LookupLocal(const AstRawString* name) {
-    return variables_.Lookup(name);
+    Variable* result = variables_.Lookup(name);
+    if (result != nullptr || scope_info_.is_null()) return result;
+    return LookupInScopeInfo(name);
   }
 
+  Variable* LookupInScopeInfo(const AstRawString* name);
+
   // Lookup a variable in this scope or outer scopes.
   // Returns the variable or NULL if not found.
   Variable* Lookup(const AstRawString* name);
 
   // Declare a local variable in this scope. If the variable has been
   // declared before, the previously declared variable is returned.
   Variable* DeclareLocal(const AstRawString* name, VariableMode mode,
                          InitializationFlag init_flag, Variable::Kind kind,
                          MaybeAssignedFlag maybe_assigned_flag = kNotAssigned);
 
@@ skipping 704 matching lines @@
   void AllocateModuleVariables();
 
  private:
   ModuleDescriptor* module_descriptor_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_SCOPES_H_