FPDebug: starting on DW_AT_location

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43566 4005530d-fff6-0310-9dd1-cebe43e6787f
FPDebug/GDBMI: memreader via gdb

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43567 4005530d-fff6-0310-9dd1-cebe43e6787f