Oilpan: Simplify Heap::allocate

Source/platform/heap/Visitor.h

Index: Source/platform/heap/Visitor.h
diff --git a/Source/platform/heap/Visitor.h b/Source/platform/heap/Visitor.h
index 8e6218c8d15dfea8e30689374b99d1a90117ead9..d3f066b41609e3ced956033c6947b3b56551b2f0 100644
--- a/Source/platform/heap/Visitor.h
+++ b/Source/platform/heap/Visitor.h
@@ -85,10 +85,12 @@ struct TraceMethodDelegate {
 struct GCInfo {
     bool hasFinalizer() const { return m_nonTrivialFinalizer; }
     bool hasVTable() const { return m_hasVTable; }
+    int heapIndex() const { return m_heapIndex; }
     TraceCallback m_trace;
     FinalizationCallback m_finalize;
     bool m_nonTrivialFinalizer;
     bool m_hasVTable;
+    int m_heapIndex;
 #if ENABLE(GC_PROFILING)
     // |m_className| is held as a reference to prevent dtor being called at exit.
     const String& m_className;
@@ -630,6 +632,7 @@ struct GCInfoAtBase {
             FinalizerTrait<T>::finalize,
             FinalizerTrait<T>::nonTrivialFinalizer,
             WTF::IsPolymorphic<T>::value,
+            HeapTypeTrait<T>::index(FinalizerTrait<T>::nonTrivialFinalizer ? true : false),
 #if ENABLE(GC_PROFILING)
             TypenameStringTrait<T>::get()
 #endif