[Patch, fortran] PR87151 - allocating array of character

[Paul Richard Thomas]

This turned out to be rather more than the allocation... The ChangeLog
and the patch tell the story well enough.

Bootstraps and regtests on FC28/x86_64 - OK for trunk and later for 8-branch?

Cheers

Paul

2018-10-07  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/87151
    * trans-array.c (gfc_get_array_span): Deal with deferred char
    array components having a TYPE_MAX_VALUE of zero.
    (gfc_array_init_size): Use the hidden string length component
    to build the descriptor dtype.
    (gfc_array_allocate): Remove the erroneous replacement of the
    charlen backend decl with a temporary.
    (gfc_conv_expr_descriptor): Use the ss_info string length in
    the case of deferred character components.
    (gfc_alloc_allocatable_for_assignment): Actually compare the
    string lengths for deferred characters. Make sure that kind > 1
    is handled correctly. Set the span field of the descriptor.
    * trans-intrinsic.c (gfc_conv_intrinsic_len): Remove the stupid
    comment.

2018-10-07  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/87151
    * gfortran.dg/deferred_type_component_3.f90: New test.
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