[Bug rtl-optimization/79388] [6/7 Regression] wrong code with -O -fno-tree-coalesce-vars

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79388

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This happens because apparently nonzero_bits ((reg/v:SI 91 [ p ]), SImode)
returns 0.