[Bug tree-optimization/106922] [12/13 Regression] Bogus uninitialized warning on boost::optional<>>, missed FRE

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106922

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 53576
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53576&action=edit
testcase for missed PRE

here's a reduction that works around r12-3918-g5b8b1522e04adc but not on the
tip of the GCC 12 branch or trunk.  I'm going to reduce another for current
trunk.