[Bug tree-optimization/69652] [6 Regression] [ICE] verify_ssa fail w/ -O2 -ffast-math -ftree-vectorize

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69652

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, MASK_STORE you don't want to handle in that loop, that is a store.
MASK_LOAD is an exception, so IMHO you should just check for is_gimple_assign
|| MASK_LOAD.  Allowing move of arbitrary other stmts looks dangerous.
Another question is what to do with gimple_clobber_p.  Those should have a
vdef, so we handle them likely conservatively, which might be good enough for
now.  Or does vectorization just remove them already?