GCC: support of daVinci graph format

[Alain Lichnewsky]

Hello,
I have added a patch to graph.c (in gcc) to support daVinci format. In
the present state it can show graphically the rtl structure for most of
the debugging output. Are you interested in integrating it ? Has it been
done already ? (It will be tested only on i686-linux. In its present
state it still needs some cleanups, and can deal with only 1 -d flag at
a time.)

Bye...

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Alain Lichnewsky           E-mail:lich@math.u-psud.fr
Mathematique               http://www.math.u-psud.fr/~lichnew
Universite de Paris-Sud
91405 Paris France