Implement a heap profiler for the Dart managed heap.

runtime/vm/freelist.h

Index: runtime/vm/freelist.h
diff --git a/runtime/vm/freelist.h b/runtime/vm/freelist.h
index 64f0574811c49ee13cbf2235338349c61d2ebc13..f1ac7db2c836f418b8f843950bea1e59c6f9b5ff 100644
--- a/runtime/vm/freelist.h
+++ b/runtime/vm/freelist.h
@@ -42,7 +42,7 @@ class FreeListElement {
 
   static FreeListElement* AsElement(uword addr, intptr_t size);
 
-  static bool IsSpecialClass(RawObject* raw_obj) {
+  static bool IsSpecialClass(const RawObject* raw_obj) {

[turnidge, 2012/05/29 17:50:01]

We don't seem to use "const RawObject*" much in our code:

random:runtime turnidge$ find . -type f | grep h$ | xargs grep "const
RawObject*" | wc -l
       0
random:runtime turnidge$ find . -type f | grep h$ | xargs grep "RawObject*" | wc
-l
     274

That said, I don't see any harm...

[cshapiro, 2012/06/01 04:27:02]

As an aside, our only use of const_cast outside of test code is to cast away
const from a RawObject pointer.  I would like to stomp that out in my next
change.

     return (raw_obj == minimal_element_class_) || (raw_obj == element_class_);
   }