Revert of Remove kind field from StackHandler.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 1142ed5a82cd9775e06f09bec3db25cd0bd5ab83..d5ce9b3df83097176d9b633e330c810b3c2ecf9d 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -88,7 +88,14 @@
     JS_ENTRY,
     CATCH,
     FINALLY,
+    LAST_KIND = FINALLY
   };
+
+  static const int kKindWidth = 2;
+  STATIC_ASSERT(LAST_KIND < (1 << kKindWidth));
+  static const int kIndexWidth = 32 - kKindWidth;
+  class KindField: public BitField<StackHandler::Kind, 0, kKindWidth> {};
+  class IndexField: public BitField<unsigned, kKindWidth, kIndexWidth> {};
 
   // Get the address of this stack handler.
   inline Address address() const;
@@ -107,7 +114,13 @@
 
   // Accessors.
   inline Context* context() const;
-  inline int index() const;
+  inline Kind kind() const;
+  inline unsigned index() const;
+
+  // Testers.
+  inline bool is_js_entry() const;
+  inline bool is_catch() const;
+  inline bool is_finally() const;
 
   // Generator support to preserve stack handlers.
   void Unwind(Isolate* isolate, FixedArray* array, int offset,