Emit internal rather than private symbols to make debugging final binaries a bit easier
Define non-returning functions with undef.
Fix: LFs that resolved to VA special values were not being flagged as taint sources when fed from a cached result. Ditch the taint propagation system entirely and just use VA-typed results as a signal that the context must be disabled.
Begrudgingly reinstate indirect DIE users to track things which have copied an FD and so must die before it does.