This PR contains changes that ensure the following:
* Global accessor linkage is kept hidden if its decl is resilient.
- LinkageLimit::Never is returned for Global Accessor if its decl is resilient.
- Since it's kept hidden, the use site should not expect a call to a global accessor
if the static var decl being accessed is resilient. The bypassing resilience logic
in AbstractStorageDecl::isResilient(accessingModule, decl) has been removed; to be
addressed in Package CMO optimization pass.
* sil_global linkage is kept private if its decl is resilient.
Resolves rdar://129829925
