Issue Description:

The example below demonstrates the bug. Here, Bar is used both as a top-level name for a protocol, and a name for a typealias to a property wrapper (defined in a protocol extension).

When using property wrappers, the Bar typealias is expected to resolve to the property wrapper but instead it resolves to the top-level protocol.

In the following example, "x0" will not compile while "x1" will - even though they semantically point to the same property wrapper.

protocol Bar {

{{ }}

{{}}}

{{ }}

@propertyWrapper

struct Baz: Bar {

{{ var wrappedValue: Void}}

{{ }}

{{ init() {}}

{{ wrappedValue = ()}}

    }

{{}}}

{{ }}

protocol FooProtocol {

{{ }}

{{}}}

{{ }}

extension FooProtocol {

{{ typealias Bar = Baz}}

{{ typealias BarNonConflictingName = Baz}}

{{}}}

{{ }}

struct Foo: FooProtocol {

{{ @bar var x0: Void}}

{{ @BarNonConflictingName var x1: Void}}

{{}}}