[ patch, testsuite, fortran] Replace "call abort" by "stop n"

[Thomas Koenig <tkoenig at netcologne dot de>]

Hello world,

the attached patch replaces the non-standard "call abort" by
"STOP n", where n is a number counted up from 1 for each occurrence.
This numbering was suggested by Neil Carlson.

This makes the gfortran testsuite _much_ more standard-conforming.
It also makes it easier to see _which_ of the numerous tests failed,
if anything happens.

I had to adjust the tree dump in a couple of places to check
for stop instead of abort.  In the standards tests where the
compiler was supposed to complain about call abort, I left it in :-)

OK for trunk?

Regards

	Thomas

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