Fix CHECK lines

Author: Harlan Haskins

test/ParseableInterface/show-in-interface.swift

@@ -1,5 +1,6 @@
 // RUN: %target-swift-frontend -typecheck %s -parse-stdlib -emit-parseable-module-interface-path - | %FileCheck %s
 
-// CHECK: @_show_in_interface public protocol _UnderscoredProtocol {}
+// CHECK: @_show_in_interface public protocol _UnderscoredProtocol {
+// CHECK-NEXT: }
 @_show_in_interface
 public protocol _UnderscoredProtocol {}