re PR c++/16015 (xfailed g++.dg/ext/stmtexpr1.C)

re PR c++/16015 (xfailed g++.dg/ext/stmtexpr1.C)

        PR c++/16015
        * gimplify.c (gimplify_target_expr): Handle void initializer.
        * expr.c (expand_expr_real_1) [TARGET_EXPR]: Likewise.
        * doc/c-tree.texi (Expression trees): Update TARGET_EXPR
        and AGGR_INIT_EXPR.
        * cp/semantics.c (simplify_aggr_init_expr): Don't return the slot.
        (finish_stmt_expr_expr): Update type after conversions.
        (finish_stmt_expr): Wrap initializer in CLEANUP_POINT_EXPR.
        Handle void initializer.
        * cp/tree.c (build_cplus_new): Make AGGR_INIT_EXPRs void.

From-SVN: r83320