Include what you use for the preparser.

src/utils-inl.h

Index: src/utils-inl.h
diff --git a/src/utils-inl.h b/src/utils-inl.h
index 76a3c104ef5ce5441e96276acf2ee345e5b066fb..d1fe1fe55fececbbd55638f94143b2c382b616dc 100644
--- a/src/utils-inl.h
+++ b/src/utils-inl.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -28,6 +28,8 @@
 #ifndef V8_UTILS_INL_H_
 #define V8_UTILS_INL_H_
 
+#include "utils.h"  // IWYU pragma: export
+
 #include "list-inl.h"
 
 namespace v8 {