https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93199
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The 4.7 behavior started with r181332. Then in r182283 the sink_clobbers quadratic behavior has been added. And finally r246314 got rid of the eat all memory and compile time during into ssa pass and only hangs in sink_clobbers.
