Experimental scanner: save all token data into one vector.

src/lexer/experimental-scanner.h

Index: src/lexer/experimental-scanner.h
diff --git a/src/lexer/experimental-scanner.h b/src/lexer/experimental-scanner.h
index 5b117f97b406a76dfc60b4fe8e3769191cc24b21..18d67fd7cdebfac0ab2144e0753b4879a0cfdc50 100644
--- a/src/lexer/experimental-scanner.h
+++ b/src/lexer/experimental-scanner.h
@@ -54,6 +54,11 @@ class ExperimentalScanner {
     int end_pos;
   };
 
+  struct SavedToken {
+    int beg, end;
+    Token::Value value;
+  };
+
   ExperimentalScanner(const char* fname,
                       bool read_all_at_once,
                       Isolate* isolate);
@@ -68,9 +73,7 @@ class ExperimentalScanner {
  private:
   void FillTokens();
   static const int BUFFER_SIZE = 256;
-  std::vector<v8::internal::Token::Value> token_;
-  std::vector<int> beg_;
-  std::vector<int> end_;
+  std::vector<SavedToken> token_;
   size_t current_;
   size_t fetched_;
   FILE* file_;