Fortran: Free alloc. comp. in allocated coarrays only.

    When freeing allocatable components of an allocatable coarray, add
    a check that the coarray is still allocated, before accessing the
    components.

    This patch adds to PR fortran/37336, but does not fix it completely.

    gcc/fortran/ChangeLog:
            PR fortran/37336
            * trans-array.cc (structure_alloc_comps): Deref coarray.
            (gfc_trans_deferred_array): Add freeing of components after
            check for allocated coarray.

    gcc/testsuite/ChangeLog:
            PR fortran/37336
            * gfortran.dg/coarray/alloc_comp_6.f90: New test.
            * gfortran.dg/coarray/alloc_comp_7.f90: New test.