[Patch, fortran] PR 49636 - [F03] ASSOCIATE construct confused with slightly complicated case

[Paul Richard Thomas]

This patch is a straightforward recycling of existing code to replace
an incomplete copy elsewhere.

Bootstraps and regtests on FC27/x86_64 - OK for trunk down to 7-branch?

Paul

2018-05-19  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/49636
    * trans-array.c (gfc_get_array_span): Renamed from
    'get_array_span'.
    (gfc_conv_expr_descriptor): Change references to above.
    * trans-array.h : Add prototype for 'gfc_get_array_span'.
    * trans-stmt.c (trans_associate_var): If the associate name is
    a subref array pointer, use gfc_get_array_span for the span.

2018-05-19  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/49636
    * gfortran.dg/associate_38.f90: New test.
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