Do not mark decls used, just to prevent unloading!
Do not mark decls used, just to prevent unloading!

This has the side effect that many symbols will need to be emitted.
It's much cheaper to not DeclUnload these decls instead.

marsupial/cling,marsupial/cling,karies/cling,karies/cling,karies/cling,marsupial/cling,karies/cling,root-mirror/cling,karies/cling,root-mirror/cling,marsupial/cling,marsupial/cling,root-mirror/cling,root-mirror/cling,karies/cling,root-mirror/cling,marsupial/cling,root-mirror/cling