[Bug tree-optimization/70130] [6 Regression] h264ref fails with verification error starting with r231674

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70130

--- Comment #17 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Though as I look at it, the "p" field is undefined in Alan's test.  Let me fix
that and see what we get.