Fix issues when stressing compaction with WeakMaps.

test/cctest/test-weakmaps.cc

 // Copyright 2011 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 47 matching lines @@
 
 static int NumberOfWeakCalls = 0;
 static void WeakPointerCallback(v8::Persistent<v8::Value> handle, void* id) {
   ASSERT(id == reinterpret_cast<void*>(1234));
   NumberOfWeakCalls++;
   handle.Dispose();
 }
 
 
 TEST(Weakness) {
+  FLAG_incremental_marking = false;

[Vyacheslav Egorov (Chromium), 2012/04/19 10:25:43]

do we want some sort of todo referencing an issue here?

   LocalContext context;
   v8::HandleScope scope;
   Handle<JSWeakMap> weakmap = AllocateJSWeakMap();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
 
   // Keep global reference to the key.
   Handle<Object> key;
   {
     v8::HandleScope scope;
     Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
@@ skipping 138 matching lines @@
     PutIntoWeakMap(weakmap, keys[i], Handle<Smi>(Smi::FromInt(i)));
   }
 
   // Force compacting garbage collection. The subsequent collections are used
   // to verify that key references were actually updated.
   CHECK(FLAG_always_compact);
   HEAP->CollectAllGarbage(Heap::kNoGCFlags);
   HEAP->CollectAllGarbage(Heap::kNoGCFlags);
   HEAP->CollectAllGarbage(Heap::kNoGCFlags);
 }