[Bug tree-optimization/66726] missed optimization, factor conversion out of COND_EXPR

[kugan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66726

--- Comment #18 from kugan at gcc dot gnu.org ---
Reverted r233362 as it caused PR69786 and PR69781. I will test for these and
post a revised patch for next stage1.