Correctly report callstack when current function is FunctionCall builtin

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 38451d11b7579d09866960888bd7191d38d03fb0..2783a08806e1b00fe73db35e2dcc761225429c8b 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -120,6 +120,9 @@ class CodeEntry {
     no_frame_ranges_ = ranges;
   }
 
+  void SetBuiltinId(Builtins::Name id);
+  Builtins::Name builtin_id() const { return builtin_id_; }
+
   void CopyData(const CodeEntry& source);
   uint32_t GetCallUid() const;
   bool IsSameAs(CodeEntry* entry) const;
@@ -128,7 +131,8 @@ class CodeEntry {
   static const char* const kEmptyResourceName;
 
  private:
-  Logger::LogEventsAndTags tag_;
+  Logger::LogEventsAndTags tag_ : 8;
+  Builtins::Name builtin_id_ : 8;
   const char* name_prefix_;
   const char* name_;
   const char* resource_name_;
@@ -422,6 +426,9 @@ class ProfileGenerator {
   static const char* const kAnonymousFunctionName;
   static const char* const kProgramEntryName;
   static const char* const kGarbageCollectorEntryName;
+  // Used to represent frames for which we have no reliable way to
+  // detect function.
+  static const char* const kUnresolvedFunctionName;
 
  private:
   INLINE(CodeEntry* EntryForVMState(StateTag tag));
@@ -430,6 +437,7 @@ class ProfileGenerator {
   CodeMap code_map_;
   CodeEntry* program_entry_;
   CodeEntry* gc_entry_;
+  CodeEntry* unresolved_entry_;
   SampleRateCalculator sample_rate_calc_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileGenerator);