[turbofan] Make js-typed-lowering.h self contained.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 372071c4373feb8d0bfe45a311606bb320a0744e..860ef8ad3e0c466c162f3897b2ec5dc389a00654 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -6,10 +6,16 @@
 #define V8_COMPILER_JS_TYPED_LOWERING_H_
 
 #include "src/compiler/graph-reducer.h"
+#include "src/compiler/opcodes.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
+
+// Forward declarations.
+class Factory;
+
+
 namespace compiler {
 
 // Forward declarations.