[Bug rtl-optimization/66790] Invalid uninitialized register handling in REE

[derodat at adacore dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66790

--- Comment #1 from Pierre-Marie de Rodat <derodat at adacore dot com> ---
Created attachment 35923
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35923&action=edit
Part of the reproducer