[runtime] Change MessageLocation::function to SFI.

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index 8e38ff0de8d5d23bc36d3d02d077cc91a7128bd0..745bc2a46954e1c8079028f36b03498cfc7c274e 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -23,25 +23,26 @@ class AbstractCode;
 class FrameArray;
 class JSMessageObject;
 class LookupIterator;
+class SharedFunctionInfo;
 class SourceInfo;
 
 class MessageLocation {
  public:
   MessageLocation(Handle<Script> script, int start_pos, int end_pos);
   MessageLocation(Handle<Script> script, int start_pos, int end_pos,
-                  Handle<JSFunction> function);
+                  Handle<SharedFunctionInfo> shared);
   MessageLocation();
 
   Handle<Script> script() const { return script_; }
   int start_pos() const { return start_pos_; }
   int end_pos() const { return end_pos_; }
-  Handle<JSFunction> function() const { return function_; }
+  Handle<SharedFunctionInfo> shared() const { return shared_; }
 
  private:
   Handle<Script> script_;
   int start_pos_;
   int end_pos_;
-  Handle<JSFunction> function_;
+  Handle<SharedFunctionInfo> shared_;
 };
 
 class StackFrameBase {