gimplify.c (gimplify_expr): Set GS_ALL_DONE when appropriate.

gcc:
	* gimplify.c (gimplify_expr): Set GS_ALL_DONE when appropriate.
	Don't change GS_OK to GS_ALL_DONE.  Make sure that all cases set
	ret appropriately.
	(gimplify_compound_lval): Return GS_ALL_DONE as appropriate.
gcc/cp:
	* semantics.c (simplify_aggr_init_expr): Use INIT_EXPR.

From-SVN: r159125