* trans.c (lvalue_required_p): Take base node directly instead
of its parent. Rename second parameter to 'gnu_type'.
<N_Indexed_Component>: Return 0 if the node isn't the prefix.
<N_Slice>: Likewise.
(Identifier_to_gnu): Rename parent_requires_lvalue to require_lvalue.
Adjust calls to lvalue_required_p.
From-SVN: r130626
