Move GetRootListIndex into Heap.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 29e875c11a1c41a8d68d83b8831fb61973e82908..ad62980a7924787c5851e59df73014cfe428f81f 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4808,6 +4808,20 @@ bool Heap::RootIsImmortalImmovable(int root_index) {
 }
 
 
+bool Heap::GetRootListIndex(Handle<HeapObject> object,
+                            Heap::RootListIndex* index_return) {
+  Object* ptr = *object;
+#define IMMORTAL_IMMOVABLE_ROOT(Name)            \
+  if (ptr == roots_[Heap::k##Name##RootIndex]) { \
+    *index_return = k##Name##RootIndex;          \
+    return true;                                 \
+  }
+  IMMORTAL_IMMOVABLE_ROOT_LIST(IMMORTAL_IMMOVABLE_ROOT)
+#undef IMMORTAL_IMMOVABLE_ROOT
+  return false;
+}
+
+
 #ifdef VERIFY_HEAP
 void Heap::Verify() {
   CHECK(HasBeenSetUp());