[Distributed] distributed func checks now work in protocols & dont crash

lib/Sema/CodeSynthesisDistributedActor.cpp

@@ -793,7 +793,6 @@ FuncDecl *GetDistributedThunkRequest::evaluate(
     return nullptr;
 
   auto &C = distributedTarget->getASTContext();
-  auto DC = distributedTarget->getDeclContext();
 
   if (!getConcreteReplacementForProtocolActorSystemType(distributedTarget)) {
     // Don't synthesize thunks, unless there is a *concrete* ActorSystem.
@@ -817,9 +816,6 @@ FuncDecl *GetDistributedThunkRequest::evaluate(
     if (!C.getLoadedModule(C.Id_Distributed))
       return nullptr;
 
-    auto nominal = DC->getSelfNominalTypeDecl(); // NOTE: Always from DC
-    assert(nominal);
-
     // --- Prepare the "distributed thunk" which does the "maybe remote" dance:
     return createDistributedThunkFunction(func);
   }