[Bug rtl-optimization/85925] [7/8/9 regression] Mis-compilation at -02, masking with 257 goes wrong in combine

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85925

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #44982|0                           |1
        is obsolete|                            |

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Created attachment 44983
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44983&action=edit
Tentative fix #2

Second try, without the thinko of the previous patch.