[Bug tree-optimization/85168] [7/8 Regression] ICE in tree-ssa-coalesce.c: SSA corruption: Unable to coalesce ssa_names which are marked as MUST COALESCE when -O2 is used

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85168

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 43820
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43820&action=edit
patch in testing