[Patch, fortran] PR80442 Handle DATA statement with iteration var in array slice

[Nicolas Koenig]

Hello everyone,

since everybody seems to be submitting patches the last few days, I 
thought I might as well :)
Attached is a patch that makes the compiler capable of dealing with 
implied do variables in
array slices in data statements.
The copying of the expressions is necessary since 
gfc_simplify_expr(expr, 1) substitutes every
symbol in expr that is on the iter_stack with its value.

Ok for trunk?

Nicolas

Regression tested for x86_64-pc-linux-gnu.

Changelog:
2017-05-09  Nicolas Koenig  <koenigni@student.ethz.ch>

         PR fortran/80442
         * array.c (gfc_ref_dimen_size): Simplify stride
         expression
         * data.c (gfc_advance_section): Simplify start,
         end and stride expressions
         (gfc_advance_section): Simplify start and end
         expressions
         (gfc_get_section_index): Simplify start expression

2017-05-09  Nicolas Koenig  <koenigni@student.ethz.ch>

         PR fortran/80442
         * gfortran.dg/impl_do_var_data.f90: New Test


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