[Isolates] Fixing Win32 compile and running tests failure.

src/ast.cc

 // Copyright 2010 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 71 matching lines @@
     inside_with_(inside_with),
     is_trivial_(false),
     reaching_definitions_(NULL),
     is_primitive_(false) {
   // names must be canonicalized for fast equality checks
   ASSERT(name->IsSymbol());
 }
 
 
 VariableProxy::VariableProxy(bool is_this)
-  : is_this_(is_this),
+  : var_(NULL),
+    is_this_(is_this),
     reaching_definitions_(NULL),
     is_primitive_(false) {
 }
 
 
 void VariableProxy::BindTo(Variable* var) {
   ASSERT(var_ == NULL);  // must be bound only once
   ASSERT(var != NULL);  // must bind
   ASSERT((is_this() && var->is_this()) || name_.is_identical_to(var->name()));
   // Ideally CONST-ness should match. However, this is very hard to achieve
@@ skipping 1043 matching lines @@
   SetStackOverflow();
 }
 
 
 void CopyAstVisitor::VisitDeclaration(Declaration* decl) {
   UNREACHABLE();
 }
 
 
 } }  // namespace v8::internal