[patch, fortran] Committed fix for PR 56782

[Thomas Koenig]

Hello world,

I committed the attached patch as obvious to fix the regression
with array constructors on trunk, after regression-testing.

Will commit to 4.8 next.

	Thomas

2013-04-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56782
         * frontend-passes.c (callback_reduction):  Dont't do
         any simplification if there is only a single element
         which has an iterator.

2013-04-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56782
         * gfortran.dg/array_constructor_44.f90:  New test.
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