[Bug rtl-optimization/63156] web can't handle AUTOINC correctly

[steven at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63156

--- Comment #7 from Steven Bosscher <steven at gcc dot gnu.org> ---
(In reply to Carrot from comment #6)
> Since it is intentionally to remove flag DF_REF_READ_WRITE on use,

Ah, but I don't think that was the correct fix. The DEF and USE refs should
both have the flag set.