[Bug tree-optimization/90989] [9 Regression] incorrrect strlen result after second strcpy into the same destination

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90989

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
I will backport it today.  There are no followup fixes to this one.