TrackerReader: style fixes, no functional changes intended
ICNS translator: use delete [] where new [] was used
Debugger: Handle DW_FORM_exprloc.

Get rid of AC_EXPRESSION. DW_FORM_exprloc is for all practical intents
and purposes identical to DW_FORM_block except with a more explicit
intent. As such, simply treat it the same as a block attribute. Gets
value resolution working on DWARF4.