[Bug target/97250] Implement -march=x86-64-v2, -march=x86-64-v3, -march=x86-64-v4 for x86-64

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
x86-64-v2 includes CMPXCHG16B, aka CX16. But -mcx16 doesn't define __CX16__.