* expr.c (expand_increment): Add third parameter to know when to
        ignore the result value.
        (store_constructor): Ditto.
        (expand_expr, case PREINCREMENT_EXPR): Ditto.
        (expand_expr, case PREDECREMENT_EXPR): Ditto.
        (expand_expr, case POSTINCREMENT_EXPR): Ditto.
        (expand_expr, case POSTDECREMENT_EXPR): Ditto.
        * tree.c (stabilize_reference): Always ignore the first operand of
        COMPOUND_EXPRs.

From-SVN: r11939