[Bug target/99312] __ARM_ARCH is not implemented correctly when compiled with -march=armv8.1-a

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99312

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://developer.arm.com/documentation/101028/latest