Merge branch 'fix-fwd-enum-resolution'

Merge branch 'fix-fwd-enum-resolution'

Andrii Nakryiko says:

====================
This patchset adds ability to resolve forward-declared enums into their
corresponding full enum definition types during type deduplication,
eliminating one of the reasons for having duplicated graphs of types.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>