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

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/1091723002

Cr-Commit-Position: refs/heads/master@{#27861}

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.