[Patch, Fortran, committed] Free loop and gfc_ss data

[Tobias Burnus]

Committed as Rev. 190586 after successful regtesting.

That's the version I also had attached to 
http://gcc.gnu.org/ml/fortran/2012-08/msg00118.html; as written there:

"The patch is incomplete, e.g. "argss" of gfc_conv_procedure_call is not 
(or not always) freed. Ditto for rss of gfc_trans_assignment_1; ditto 
for lss and rss of gfc_trans_pointer_assignment."

Tobias
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