debug/9864: [3.2/3.3/3.4 regression] Fortran ICE in dwarf2out:add_abstract_origin_attribute with -g -O -finline-functions

[Steven Bosscher]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9864

I've just analyzed this PR a bit more and I've reduced the test case
to managable proportions (12 lines instead of almost 500 :-).

This looks like something specific to Fortran (i.e. something we'll
only be able to reproduce with the Fortran front end), so I've added
Toon to the "Who's interested" list.

Greetz
Steven