Simplify and speed up address-to-page cache for conservative stack scanning.

Source/platform/heap/ThreadState.h

Index: Source/platform/heap/ThreadState.h
diff --git a/Source/platform/heap/ThreadState.h b/Source/platform/heap/ThreadState.h
index 8362513474da663fd2fdb36e8e7fc13dfcd942ec..e11e88ba590219e4eda73429b80b39bc58a41709 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -467,7 +467,7 @@ public:
     // address ranges for the Blink heap. If the address is in the Blink
     // heap the containing heap page is returned.
     HeapContainsCache* heapContainsCache() { return m_heapContainsCache.get(); }
-    BaseHeapPage* contains(Address);
+    BaseHeapPage* contains(Address address) { return heapPageFromAddress(address); }
     BaseHeapPage* contains(void* pointer) { return contains(reinterpret_cast<Address>(pointer)); }
     BaseHeapPage* contains(const void* pointer) { return contains(const_cast<void*>(pointer)); }