[patch, fortran, committed] Fix PR 50130

[Thomas Koenig]

Hello world,

I committed the attached patch as obvious after regression-testing.
Revision is 177940.

Will commit to 4.6 in a few days.

	Thomas

2011-08-21  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/50130
         * resolve.c (resolve_array_ref):  Don't calculate upper bound
         if the stride is zero.

2011-08-21  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/50130
         * gfortran.dg/zero_stride_1.f90:  New test
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