Sema: Any is representable-in-ObjC in bridged positions.

Author: jckarter

lib/AST/Type.cpp

@@ -1951,6 +1951,14 @@ getObjCObjectRepresentable(Type type, const DeclContext *dc) {
   if (type->isObjCExistentialType())
     return ForeignRepresentableKind::Object;
 
+  // Any can be bridged to id.
+  if (type->getASTContext().LangOpts.EnableIdAsAny) {
+    if (auto protoCompTy = type->getAs<ProtocolCompositionType>()) {
+      if (protoCompTy->getProtocols().empty())
+        return ForeignRepresentableKind::Bridged;
+    }
+  }
+  
   // Class-constrained generic parameters, from ObjC generic classes.
   if (auto tyContext = dc->getInnermostTypeContext())
     if (auto clas = tyContext->getAsClassOrClassExtensionContext())

test/attr/attr_objc_any.swift

@@ -0,0 +1,16 @@
+// RUN: %target-swift-frontend -parse -verify %s -enable-id-as-any
+// REQUIRES: objc_interop
+
+import Foundation
+
+@objc var foo: Any // expected-error {{@objc can only be used with members of classes, @objc protocols, and concrete extensions of classes}}
+
+class Foo: NSObject {
+  override init() {}
+
+  @objc var property: Any
+
+  @objc func method(x: Any) -> Any { return x }
+
+  @objc func indirectAny(x: UnsafePointer<Any>) {} // expected-error{{type of the parameter cannot be represented in Objective-C}}
+}