Reland 'Additional HandleScopes to limit Handle consumption.'

src/handles.h

 // 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.
 
 #ifndef V8_HANDLES_H_
 #define V8_HANDLES_H_
 
 #include "src/objects.h"
 
 namespace v8 {
@@ skipping 208 matching lines @@
 
   // Closes the HandleScope (invalidating all handles
   // created in the scope of the HandleScope) and returns
   // a Handle backed by the parent scope holding the
   // value of the argument handle.
   template <typename T>
   Handle<T> CloseAndEscape(Handle<T> handle_value);
 
   Isolate* isolate() { return isolate_; }
 
+  // Limit for number of handles with --check_handle-count. This is
+  // large enough to compile natives and pass unit tests with some
+  // slack for future changes to natives.
+  static const int kCheckHandleThreshold = 30 * 1024;
+
  private:
   // Prevent heap allocation or illegal handle scopes.
   HandleScope(const HandleScope&);
   void operator=(const HandleScope&);
   void* operator new(size_t size);
   void operator delete(void* size_t);
 
   Isolate* isolate_;
   Object** prev_next_;
   Object** prev_limit_;
@@ skipping 68 matching lines @@
 
   void Initialize() {
     next = limit = NULL;
     level = 0;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_