[Bug target/122953] New: __ARM_PCS_AAPCS64 is incorrectly defined for aarch64-mingw

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122953

            Bug ID: 122953
           Summary: __ARM_PCS_AAPCS64 is incorrectly defined for
                    aarch64-mingw
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64-mingw

__ARM_PCS_AAPCS64 is currently always defined for all aarch64 targets but that
is incorrect.

ACLE says:
__ARM_PCS_AAPCS64 is defined to 1 if the default procedure calling standard for
the translation unit conforms to the [AAPCS64].