[embedded] Add once-dependent.swift test to showcase lazy initializers dependending on other lazy initializers

Author: kubamracek

test/embedded/once-dependent.swift

@@ -0,0 +1,53 @@
+// RUN: %target-swift-frontend %s %S/Inputs/print.swift -enable-experimental-feature Embedded -c -o %t/main.o
+// RUN: %target-clang %t/main.o -o %t/a.out -dead_strip
+// RUN: %target-run %t/a.out | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: optimized_stdlib
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
+public struct MyStructA {
+  static var singleton = MyStructA()
+  
+  init() {
+    print("MyStructA.init")
+    _ = MyStructB.singleton
+    print("MyStructA.init done")
+  }
+}
+
+public struct MyStructB {
+  static var singleton = MyStructB()
+  
+  init() {
+    print("MyStructB.init")
+    _ = MyStructC.singleton
+    print("MyStructB.init done")
+  }
+}
+
+public struct MyStructC {
+  static var singleton = MyStructC()
+  
+  init() {
+    print("MyStructC.init")
+    print("MyStructC.init done")
+  }
+}
+
+@main
+struct Main {
+  static func main() {
+    print("Start")
+    _ = MyStructA.singleton
+
+    // CHECK: Start
+    // CHECK-NEXT: MyStructA.init
+    // CHECK-NEXT: MyStructB.init
+    // CHECK-NEXT: MyStructC.init
+    // CHECK-NEXT: MyStructC.init done
+    // CHECK-NEXT: MyStructB.init done
+    // CHECK-NEXT: MyStructA.init done
+  }
+}

test/embedded/once-multithreaded.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
 // RUN: %{python} %utils/split_file.py -o %t %s
 
-// RUN: %target-swift-frontend %t/Main.swift %S/Inputs/print.swift -import-bridging-header %t/BridgingHeader.h -Rmodule-loading -enable-experimental-feature Embedded -c -o %t/main.o
+// RUN: %target-swift-frontend %t/Main.swift %S/Inputs/print.swift -import-bridging-header %t/BridgingHeader.h -enable-experimental-feature Embedded -c -o %t/main.o
 // RUN: %target-clang %t/main.o -o %t/a.out -dead_strip
 // RUN: %target-run %t/a.out | %FileCheck %s