[Bug tree-optimization/123518] gimple_make_forwarder_block should not create degenerated phis

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123518

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 63310
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63310&action=edit
testcase change needed too