addr2line: Add --pretty-print option to show all information on one line.

addr2line: Add --pretty-print option to show all information on one line.

This adds an option --pretty-print to eu-addr2line to show all information
on one line and all inlines on a line of their own. This mimics the same
option from binutils addr2line, but without the short option variant -p.
Since we already use -p to select the process.

Example output:

eu-addr2line --pretty-print -s -i -f -C -p$(pidof firefox) 0x00007f368c6f8915
mozilla::ReentrantMonitor::Wait(unsigned int) at ReentrantMonitor.h:92
 (inlined by) mozilla::ReentrantMonitorAutoEnter::Wait(unsigned int) at ReentrantMonitor.h:190

A couple of tests were added to check the output matches that of
binutils addr2line.

Signed-off-by: Mark Wielaard <mjw@redhat.com>