Fix issue 553: function frame is skipped in profile when compare stub is called.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 024065abf7eb909b1f0adbbad6a3ec62a58c5d23..19860adba7f4739e7d6440b369dbe57f4f83d051 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -607,11 +607,12 @@ class SafeStackFrameIterator BASE_EMBEDDED {
   void Advance();
   void Reset();
 
- private:
   static bool IsWithinBounds(
       Address low_bound, Address high_bound, Address addr) {
     return low_bound <= addr && addr <= high_bound;
   }
+
+ private:
   bool IsValidStackAddress(Address addr) const {
     return IsWithinBounds(low_bound_, high_bound_, addr);
   }