Incremental GCInfo descriptor table expansion.

Source/platform/heap/Heap.cpp

Index: Source/platform/heap/Heap.cpp
diff --git a/Source/platform/heap/Heap.cpp b/Source/platform/heap/Heap.cpp
index 8782ccbf3cb2d1443903535692aa667e85abc194..01d82954d22964642466108e61b46867b232d9da 100644
--- a/Source/platform/heap/Heap.cpp
+++ b/Source/platform/heap/Heap.cpp
@@ -2004,9 +2004,7 @@ void Heap::init()
     s_allocatedSpace = 0;
     s_markedObjectSize = 0;
 
-    const size_t tableSize = gcInfoIndexMax * sizeof(GCInfo);
-    s_gcInfoTable = reinterpret_cast<GCInfo const**>(new uint8_t[tableSize]);
-    memset(s_gcInfoTable, 0, tableSize);
+    GCInfoTable::init();
 }
 
 void Heap::shutdown()
@@ -2040,8 +2038,7 @@ void Heap::doShutdown()
     s_ephemeronStack = nullptr;
     delete s_regionTree;
     s_regionTree = nullptr;
-    delete[] s_gcInfoTable;
-    s_gcInfoTable = nullptr;
+    GCInfoTable::shutdown();
     ThreadState::shutdown();
     ASSERT(Heap::allocatedSpace() == 0);
 }