[Bug tree-optimization/51005] -ftree-tail-merge slows down compilation of 20001226-1.c

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51005

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-11-07 11:00:39 UTC ---
Note that PRE already performs TODO_update_ssa_only_virtuals (well, of course
only if something marked the VOP for renaming which happens whenever it
inserts a load somewhere).  So it might indeed be not too bad to do this
(given the amount of code we can delete ...)