[embedded] Allow metadata for DynamicSelfType to support using Self in classes

test/embedded/dynamic-self.swift

@@ -0,0 +1,22 @@
+// RUN: %target-swift-emit-ir %s -enable-experimental-feature Embedded -parse-as-library | %FileCheck %s
+
+// REQUIRES: swift_in_compiler
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
+class MyClass {
+     init() {
+          Self.static_foo()
+     }
+
+     static func static_foo() {}
+}
+
+@main
+struct Main {
+     static func main() {
+          _ = MyClass()
+     }
+}
+
+// CHECK: define {{.*}}@main(