[Bug target/93230] PowerPC GCC vec_extract of a vector in memory does not fold sign/zero extension into load

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93230

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does it make sense to fold vec_extract directly into BIT_FIELD_REF in
altivec_resolve_overloaded_builtin for constants?
Or even in rs6000_fold_builtin ?

It seems like a lot of the builtins should be fold directly to gimple versions.