Fortran: Fix character-kind=4 substring resolution (PR95837)

[David Edelsohn]

On Fri, Jun 26, 2020 at 12:21 PM Thomas Koenig <tkoenig@netcologne.de> wrote:
>
> Hi David,
>
> > This patch has introduced new failures on AIX.
>
> Is there a PR or a test case for it?

PR95918

The new testcase added for the patch fails on all big endian targets,
including powerpc64-linux, powerpc-ibm-aix, s390x-linux.

gfortran.dg/char4-subscript.f90

Thanks, David