[Bug tree-optimization/67690] [5/6 Regression] wrong code with -O2 on x86_64/Linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67690

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's tail-merging.  Eventually we can fix this in replace_block_by by walking
over all defs in bb2 calling reset_flow_sensitive_info.