[Bug target/64782] -mcpu=native should be supported on aarch64

["jgreenhalgh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64782

James Greenhalgh <jgreenhalgh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jgreenhalgh at gcc dot gnu.org

--- Comment #3 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
Did the Linux kernel format for /proc/cpuinfo settle down enough that we can
sensibly parse it [1]?

When implementing this support I guess we will want to look at which kernels
are going to be out there in use, and possibly even try to detect the
/proc/cpuinfo format dynamically (Ugh!). Perhaps you just want to mandate a
minimum kernel version, and bail out if you see something older?

[1]: https://lkml.org/lkml/2014/10/24/391