Trying to clarify how the Map tagged pointer on objects is modified during 
GC. The MapWord class (objects.h) has the below comment I can't quite parse 
- specifically in the parens at the end. Am I reading right that the Map 
word isn't a heap object pointer during a full GC? Or is this comment 
incorrect/outdated?
 
  // True if this map word is a forwarding address for a scavenge
  // collection.  Only valid during a scavenge collection (specifically,
  // when all map words are heap object pointers, i.e. not during a full GC)
.
  inline bool IsForwardingAddress() const;

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