jump.c (redirect_exp_1): Rework from old redirect_exp.

jump.c (redirect_exp_1): Rework from old redirect_exp.

        * jump.c (redirect_exp_1): Rework from old redirect_exp.  Never
        commit change group changes.
        (invert_exp_1): Similarly.
        (redirect_exp, invert_exp): Use them.
        (redirect_jump_1): New.
        (invert_jump_1): New.
        (jump_optimize_1): Remove code subsumed by condexec.c.
        * rtl.h (invert_jump_1, redirect_jump_1): Declare.

From-SVN: r33474