[OG10] Reverted patch on OG10 branch

[Moore, Catherine]

FYI - I reverted this patch:

commit ea43db9372133e84f95bdb2c6934a5cc3db3d530
Author: Catherine Moore <c...@codesourcery.com>
Date:   Sat Feb 13 09:04:44 2021 -0800

    Revert "Enable gimplify GOMP_MAP_STRUCT handling of (COMPONENT_REF 
(INDIRECT_REF ...)) map clauses."

    This reverts commit bf8605f14ec33ea31233a3567f3184fee667b695.

    Regressions were reported for BZ 9574 - C++ class member mapping.