Resubmit change 6302 after fixing the compiler warning on older GCC compiler versions:

vm/heap.cc

Index: vm/heap.cc
===================================================================
--- vm/heap.cc	(revision 6329)
+++ vm/heap.cc	(working copy)
@@ -129,6 +129,14 @@
 }
 
 
+RawInstructions* Heap::FindObjectInCodeSpace(FindObjectVisitor* visitor) {
+  // The code heap can only have RawInstructions objects.
+  RawObject* raw_obj = code_space_->FindObject(visitor);
+  ASSERT(raw_obj->ptr()->class_->ptr()->instance_kind_ == kInstructions);
+  return reinterpret_cast<RawInstructions*>(raw_obj);
+}
+
+
 void Heap::CollectGarbage(Space space, ApiCallbacks api_callbacks) {
   bool invoke_api_callbacks = (api_callbacks == kInvokeApiCallbacks);
   switch (space) {