[Bug target/103422] New: -march=bogus12323123423452345 -march=armv8-a is accepted

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103422

            Bug ID: 103422
           Summary: -march=bogus12323123423452345 -march=armv8-a is
                    accepted
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

Just like PR 103421 but this one is for aarch64.