[Bug rtl-optimization/79071] Add test case for PR/65618

[james410 at cowgill dot org.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79071

--- Comment #1 from James Cowgill <james410 at cowgill dot org.uk> ---
Created attachment 40510
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40510&action=edit
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