Oilpan: Always enter a GCScope when we run a GC

Source/web/WebHeap.cpp

 /*
  * Copyright (C) 2014 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 19 matching lines @@
 
 #include "config.h"
 #include "public/web/WebHeap.h"
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 WebHeap::SafePointScope::SafePointScope()
 {
-    ThreadState::current()->enterSafePointWithPointers(this);
+    RELEASE_ASSERT(!ThreadState::current()->isAtSafePoint());
+    ThreadState::current()->enterSafePoint(ThreadState::HeapPointersOnStack, this);
 }
 
 WebHeap::SafePointScope::~SafePointScope()
 {
     ThreadState::current()->leaveSafePoint();
 }
 
 void WebHeap::collectGarbageForTesting()
 {
     Heap::collectGarbage(ThreadState::HeapPointersOnStack, ThreadState::GCWithSweep, Heap::ForcedGC);
 }
 
 void WebHeap::collectAllGarbageForTesting()
 {
     Heap::collectAllGarbage();
 }
 
 } // namespace blink