Oilpan: Fix Heap::isConsistentForGC which only checks the heap for one attached thread at this poin…

Source/heap/Heap.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 1338 matching lines @@
         HeapStats temp;
         (*it)->getStats(temp);
         stats->add(&temp);
     }
 }
 
 bool Heap::isConsistentForGC()
 {
     ASSERT(ThreadState::isAnyThreadInGC());
     ThreadState::AttachedThreadStateSet& threads = ThreadState::attachedThreads();
-    for (ThreadState::AttachedThreadStateSet::iterator it = threads.begin(), end = threads.end(); it != end; ++it)
-        return (*it)->isConsistentForGC();
+    for (ThreadState::AttachedThreadStateSet::iterator it = threads.begin(), end = threads.end(); it != end; ++it) {
+        if (!(*it)->isConsistentForGC())
+            return false;
+    }
     return true;
 }
 
 void Heap::makeConsistentForGC()
 {
     ASSERT(ThreadState::isAnyThreadInGC());
     ThreadState::AttachedThreadStateSet& threads = ThreadState::attachedThreads();
     for (ThreadState::AttachedThreadStateSet::iterator it = threads.begin(), end = threads.end(); it != end; ++it)
         (*it)->makeConsistentForGC();
 }
 
 // Force template instantiations for the types that we need.
 template class HeapPage<FinalizedHeapObjectHeader>;
 template class HeapPage<HeapObjectHeader>;
 template class ThreadHeap<FinalizedHeapObjectHeader>;
 template class ThreadHeap<HeapObjectHeader>;
 
 Visitor* Heap::s_markingVisitor;
 CallbackStack* Heap::s_markingStack;
 CallbackStack* Heap::s_weakCallbackStack;
 }