[Distributed] SILGen must consistently use prop get requests

lib/Sema/CodeSynthesisDistributedActor.cpp

@@ -38,6 +38,42 @@ using namespace swift;
 /************************ PROPERTY SYNTHESIS **********************************/
 /******************************************************************************/
 
+static VarDecl*
+lookupDistributedActorProperty(NominalTypeDecl *decl, DeclName name) {
+  assert(decl && "decl was null");
+  auto &C = decl->getASTContext();
+
+  auto clazz = dyn_cast<ClassDecl>(decl);
+  if (!clazz)
+    return nullptr;
+
+  auto refs = decl->lookupDirect(name);
+  if (refs.size() != 1)
+    return nullptr;
+
+  auto var = dyn_cast<VarDecl>(refs.front());
+  if (!var)
+    return nullptr;
+
+  Type expectedType = Type();
+  if (name == C.Id_id) {
+    expectedType = getDistributedActorIDType(decl);
+  } else if (name == C.Id_actorSystem) {
+    expectedType = getDistributedActorSystemType(decl);
+  } else {
+    llvm_unreachable("Unexpected distributed actor property lookup!");
+  }
+  if (!expectedType)
+    return nullptr;
+
+  if (!var->getInterfaceType()->isEqual(expectedType))
+    return nullptr;
+
+  assert(var->isSynthesized() && "Expected compiler synthesized property");
+  return var;
+}
+
+
 // Note: This would be nice to implement in DerivedConformanceDistributedActor,
 // but we can't since those are lazily triggered and an implementation exists
 // for the 'id' property because 'Identifiable.id' has an extension that impls