[Bug tree-optimization/78529] [7 Regression] gcc.c-torture/execute/builtins/strcat-chk.c failed with lto/O2

[renlin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78529

--- Comment #23 from Renlin Li <renlin at gcc dot gnu.org> ---
Created attachment 40472
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40472&action=edit
test case