[debugger] use handler table on unoptimized code for exception prediction.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index a5d6806640e77714d50716e75eb9e43aebd25184..12770231cf2f293800c0c777a25ebd9144de9c5d 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -710,11 +710,11 @@ class FrameSummary BASE_EMBEDDED {
 
   static FrameSummary GetFirst(JavaScriptFrame* frame);
 
-  Handle<Object> receiver() { return receiver_; }
-  Handle<JSFunction> function() { return function_; }
-  Handle<AbstractCode> abstract_code() { return abstract_code_; }
-  int code_offset() { return code_offset_; }
-  bool is_constructor() { return is_constructor_; }
+  Handle<Object> receiver() const { return receiver_; }
+  Handle<JSFunction> function() const { return function_; }
+  Handle<AbstractCode> abstract_code() const { return abstract_code_; }
+  int code_offset() const { return code_offset_; }
+  bool is_constructor() const { return is_constructor_; }
 
   void Print();