[Bug target/115756] default tuning for x86_64 produces shifts for `*240`

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115756

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Target Milestone|---                         |15.0