debug/4431: Wrong .stabs entries when using -O2

[bangerth@dealii.org]

Synopsis: Wrong .stabs entries when using -O2

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Wed Dec  4 07:52:40 2002
State-Changed-Why:
    This still happens, but with newer compilers I have to
    explicitly give -gstabs to provoke this.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4431