enable INVARIANT_SUPPORT in GENERIC in release builds

hello,

currently release version of GENERIC (or GENERIC-NODEBUG in main) does
not have INVARIANT_SUPPORT enabled.

unfortunately, the presence or absense of this option breaks the KABI
because, as i understand it, modules built with INVARIANTS won't load on
a kernel without INVARIANT_SUPPORT.

is there a reason INVARIANT_SUPPORT can't just be enabled by default?

this would remove one roadblock to separating kernel modules from the
kernel config in both pkgbase and ports, because there would be no need
to build a KABI-incompatible kernel just to build a single module with
INVARIANTS.