[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 #7 from Alan Modra <amodra at gmail dot com> 2011-08-03 03:07:13 
UTC ---
The lurking problem being that copy_rtx_if_shared_1 needs to leave RETURN
shared, and I guess mark_used_flags doesn't need to do anything with RETURN
too.