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

[pinskia at gcc dot gnu.org]

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

            Bug ID: 64782
           Summary: -mcpu=native should be supported on aarch64
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org

Now we have some different CPU supported on AARCH64. We should support
-mcpu=native.  We might need some information from the kernel which is not
supplied yet.