Oilpan: Query stack frame register instead of manual bookkeeping

Source/platform/heap/HeapTest.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 221 matching lines @@
     {                                                                      \
         return ensureMarked(objectPointer);                                \
     }
 
 class CountingVisitor : public Visitor {
 public:
     CountingVisitor()
         : Visitor(Visitor::GenericVisitorType)
         , m_count(0)
     {
+        configureEagerTraceLimit();
     }
 
     virtual void mark(const void* object, TraceCallback) override
     {
         if (object)
             m_count++;
     }
 
     virtual void markHeader(HeapObjectHeader* header, TraceCallback callback) override
     {
@@ skipping 5213 matching lines @@
     static int sTraceLazy;
 };
 
 int DeepEagerly::sTraceCalls = 0;
 int DeepEagerly::sTraceLazy = 0;
 
 TEST(HeapTest, TraceDeepEagerly)
 {
 #if !ENABLE(ASSERT)
     DeepEagerly* obj = nullptr;
-    for (int i = 0; i < 2000; i++)
+    for (int i = 0; i < 10000; i++)
         obj = new DeepEagerly(obj);
 
     Persistent<DeepEagerly> persistent(obj);
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
 
     // Verify that the DeepEagerly chain isn't completely unravelled
     // by performing eager trace() calls, but the explicit mark
     // stack is switched once some nesting limit is exceeded.
     EXPECT_GT(DeepEagerly::sTraceLazy, 2);
 #endif
@@ skipping 42 matching lines @@
     // re-adjusting both start&end indices in terms of that expanded buffer.
     EXPECT_EQ(80u, deque->size());
     i = 0;
     for (const auto& intWrapper : *deque) {
         EXPECT_EQ(i + 50, intWrapper->value());
         i++;
     }
 }
 
 } // namespace blink