[test] Disable experimental parser round trip in ModuleInterface/value_generics.swift

Author: ahoppen

test/ModuleInterface/value_generics.swift

@@ -1,6 +1,6 @@
 // RUN: %empty-directory(%t)
 // RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s -module-name ValueGeneric -enable-experimental-feature ValueGenerics -disable-availability-checking -disable-experimental-parser-round-trip
-// RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface) -module-name ValueGeneric -disable-availability-checking
+// RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface) -module-name ValueGeneric -disable-availability-checking -disable-experimental-parser-round-trip
 // RUN: %FileCheck %s < %t.swiftinterface
 
 // CHECK: public struct Vector<Element, let N : Swift.Int>