[Bug target/93811] __builtin___clear_cache() is a noop on powerpc (which is incorrect)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93811

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note ___clear_cache was originally designed for trampolines. PoewrPC64v1 ABI
does not use trampolines for nested functions.