Better pack fields in Variable

src/ast/variables.cc

 // Copyright 2011 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/variables.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/globals.h"
 
@@ skipping 16 matching lines @@
   }
   UNREACHABLE();
   return NULL;
 }
 
 Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
                    Kind kind, InitializationFlag initialization_flag,
                    MaybeAssignedFlag maybe_assigned_flag)
     : scope_(scope),
       name_(name),
+      local_if_not_shadowed_(nullptr),
+      index_(-1),
+      initializer_position_(kNoSourcePosition),
       mode_(mode),
       kind_(kind),
       location_(VariableLocation::UNALLOCATED),
-      index_(-1),
-      initializer_position_(kNoSourcePosition),
-      local_if_not_shadowed_(NULL),
       force_context_allocation_(false),
       is_used_(false),
       initialization_flag_(initialization_flag),
       maybe_assigned_(maybe_assigned_flag) {
   // Var declared variables never need initialization.
   DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
 }
 
 
 bool Variable::IsGlobalObjectProperty() const {
@@ skipping 15 matching lines @@
 
 int Variable::CompareIndex(Variable* const* v, Variable* const* w) {
   int x = (*v)->index();
   int y = (*w)->index();
   // Consider sorting them according to type as well?
   return x - y;
 }
 
 }  // namespace internal
 }  // namespace v8