In file heap_profiler.cpp

• member functions like size(), hash(), operator==, need const.

• Consider replacing private HashTable implementation with standard one.

• L479 bounds on j are infinite if numFrames < skipEndFrames. (This was fixed as a side-effect of SERVER-45357)

• L486 first paren isn't necessarily start of function params.
  for example, "_Z1gIEPFviEv" demangles to "void (*g<>())(int)", a function returning a function pointer. Maybe just don't demangle.

• L502 StringData receives a dangling reference.
  (This was fixed as a side-effect of SERVER-45357)
   
• sortByActiveBytes comparator is not a stable order as the elements can shift position during the sort. Fix this comparator (SERVER-41787).