[Bug rtl-optimization/49941] [4.7 Regression] segmentation fault in redirect_jump_2

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49941

--- Comment #2 from Alan Modra <amodra at gmail dot com> 2011-08-02 15:29:57 
UTC ---
So, rebuild_jump_labels doesn't add back this JUMP_LABEL, because
mark_jump_label does as its comment says:
   If INSN is a JUMP_INSN and there is at least one
   CODE_LABEL referenced in INSN as a jump target, then store the last
   one in JUMP_LABEL (INSN).

and we have ret_rtx here in the JUMP_LABEL, not a CODE_LABEL.