[embedded] Add a test showcasing class method runtime dispatch

Author: kubamracek

test/embedded/class-func.swift

@@ -0,0 +1,30 @@
+// RUN: %target-run-simple-swift(%S/Inputs/print.swift -enable-experimental-feature Embedded -parse-as-library -runtime-compatibility-version none -wmo -Xfrontend -disable-objc-interop) | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: optimized_stdlib
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
+@main
+struct Main {
+     static func main() {
+          let array: [MyClass] = [MyClass(), MySubclass()]
+          for e in array {
+               e.method()
+          }
+     }
+}
+
+class MyClass {
+    func method() { Self.foo() }
+
+    class func foo() { print("MyClass.foo") }
+}
+
+class MySubclass: MyClass {
+
+    override class func foo() { print("MySubclass.foo") }
+}
+
+// CHECK: MyClass.foo
+// CHECK: MySubclass.foo