[Bug target/84413] -mtune=skylake-avx512,cannonlake,icelake disable many tuning

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84413

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |igor.v.tsimbalist at intel dot com
                   |                            |, pavel.v.chupin at gmail dot com
   Target Milestone|---                         |8.0
            Summary|-march=skylake-avx512       |-mtune=skylake-avx512,canno
                   |disables BT instruction     |nlake,icelake disable many
                   |                            |tuning