[Patch, fortran] PR29396 PR29606 PR30625 and PR30871 - subreference array pointers.

[Dominique Dhumieres]

I have applied the patch on top of revision 128511.
On Darwin, it works as advertised with no new failures (only the old
ones nobody cares to fix!) for the test suite with both 32 and 64
bit modes.

Thanks for the work.

Dominique