[cxx-interop] Test symbolic interface generation for new features

This adds a test that ensures that a symbolic interface for a C++ module will include these features:
* move-only types
* virtual methods

Default arguments are already tested.

rdar://125816549

Author: egorzhdan

test/Interop/Cxx/symbolic-imports/print-symbolic-module-interface.swift

@@ -60,6 +60,19 @@ public:
     };
 };
 
+#define IMMORTAL_FRT                                                         \
+    __attribute__((swift_attr("import_reference")))                              \
+    __attribute__((swift_attr("retain:immortal")))                               \
+    __attribute__((swift_attr("release:immortal")))
+
+struct IMMORTAL_FRT MyImmortal {
+    virtual void foo() const {};
+};
+
+struct NonCopyable {
+    NonCopyable(const NonCopyable& other) = delete;
+};
+
 // CHECK:     enum ns {
 // CHECK-NEXT: struct B {
 // CHECK-NEXT:    init()
@@ -98,3 +111,10 @@ public:
 // CHECK-NEXT:     typealias Y = Any
 // CHECK-NEXT:   }
 // CHECK-NEXT: }
+// CHECK: class MyImmortal {
+// CHECK-NEXT:   func foo()
+// CHECK-NEXT: }
+// CHECK-NEXT: struct NonCopyable {
+// CHECK-NEXT:   @available(*, deprecated, message:
+// CHECK-NEXT:   init()
+// CHECK-NEXT: }