[Bug middle-end/84433] gcc 7 and before miscompile loop and remove exit due to incorrect range calculation

[acsawdey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84433

--- Comment #7 from acsawdey at gcc dot gnu.org ---
Created attachment 43462
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43462&action=edit
revised test case