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 9d4a7e36cb14a4c1678d85a8684e89e676f9524f..411cbdbab270c700f528a7a9ecd6077b995a0210 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -122,6 +122,9 @@ 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;
@@ -130,7 +133,8 @@ 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_;
@@ -425,6 +429,9 @@ 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));
@@ -433,6 +440,7 @@ class ProfileGenerator {
   CodeMap code_map_;
   CodeEntry* program_entry_;
   CodeEntry* gc_entry_;
+  CodeEntry* unresolved_entry_;
   SampleRateCalculator sample_rate_calc_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileGenerator);