[Bug target/81759] Improve data tracking for _pext_u64 and __builtin_ffsll

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81759

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |missed-optimization
             Target|                            |x86_64-pc-linux-gnu
           Severity|normal                      |enhancement