[Bug target/77571] __clear_cache is broken on arm64 for big.little where the cache line sizes are different between cores

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77571

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is even reverting the patch can still cause issues.  Really this code
should just hard code 4 as the smallest size.
Or change the loop to get the sizes through the whole loop.