I verified the PR by running the entire test suite of Odin itself with
`-sanitize:address` and also the ols test suite (which caused unique problems
before).
A test has also been added with some problematic code, Windows seems to
have problems with asan in CI or in general so it is not ran there.
The LB_ABI_COMPUTE_RETURN_TYPES block has been removed entirely because
it was unused, I got pretty confused why it didn't effect anything at
first.
Fixes#3211
