[NFC] [ModuleTrace] Add negative test case for cycles in trace emission (ep2).

Context: rdar://67704000.

test/Driver/Inputs/imported_modules/ComplexModuleGraph2/module.modulemap

@@ -14,7 +14,11 @@ module CoreDaemon {
 }
 
 module DaemonKit {
-  header "DaemonKit.h"
+  umbrella header "DaemonKit/DaemonKit.h"
+  explicit module ViolateSecondLawOfThermodynamics {
+    header "DaemonKit/ViolateSecondLawOfThermodynamics.h"
+    export *
+  }
   export *
 }