Move FieldType to separate h/cc files.

src/field-type.h

Index: src/field-type.h
diff --git a/src/field-type.h b/src/field-type.h
new file mode 100644
index 0000000000000000000000000000000000000000..e390fca53ee39cbd3af0a1aa63a6915725c72ab0
--- /dev/null
+++ b/src/field-type.h
@@ -0,0 +1,42 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_FIELD_TYPE_H_
+#define V8_FIELD_TYPE_H_
+
+#include "src/handles.h"
+#include "src/objects.h"
+#include "src/ostreams.h"
+
+namespace v8 {
+namespace internal {
+
+class FieldType : public Object {
+ public:
+  static FieldType* None();
+  static FieldType* Any();
+  static Handle<FieldType> None(Isolate* isolate);
+  static Handle<FieldType> Any(Isolate* isolate);
+  static FieldType* Class(i::Map* map);
+  static Handle<FieldType> Class(i::Handle<i::Map> map, Isolate* isolate);
+  static FieldType* cast(Object* object);
+
+  bool NowContains(Object* value);
+  bool NowContains(Handle<Object> value);
+  bool IsClass();
+  Handle<i::Map> AsClass();
+  bool IsNone() { return this == None(); }
+  bool IsAny() { return this == Any(); }
+  bool NowStable();
+  bool NowIs(FieldType* other);
+  bool NowIs(Handle<FieldType> other);
+  Type* Convert(Zone* zone);
+
+  void PrintTo(std::ostream& os);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_FIELD_TYPE_H_