[Patch, gfortran] Fix for PR 12703.

[Toon Moene]

Fortran 90/95 and onwards allow zero-sized objects, so we should allow 
allocating them.

Fixes PR 12703, but not 12704, which shows, among other things, that 
MAXLOC doesn't work for zero-sized arrays.

The patch below was tested on powerpc-unknown-linux-gnu (bootstrap C and 
f95, make -k check of f95 test suite only).

OK to apply ?

-- 
Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
GNU Fortran 95: http://gcc.gnu.org/fortran/ (under construction)
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