Log profiler: better object tracking.

Log profiler: better object tracking.

* decode.c: the --track option can now take more than one object address to track.
Added the --find option to automatically track objects of a given size and/or
type name. When backtrace and heapshot information is present, we can now, for
example, find when and where all the byte[] arrays bigger than a certain size
have been created and which other heap objects reference them.