WIP: Parser: delay string internalization.

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index 037da5b1739a302cbdda71ce50e82a3055c0d712..e8b2de0ccf362ff450b9d248129d5f9a0fb453c2 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -22,6 +22,8 @@ namespace internal {
 
 
 class ParserRecorder;
+class ParserSymbol;
+class ParserSymbolTable;
 
 
 // Returns the value (0 .. 15) of a hexadecimal character c.
@@ -376,9 +378,8 @@ class Scanner {
     return next_.literal_chars->is_contextual_keyword(keyword);
   }
 
-  Handle<String> AllocateNextLiteralString(Isolate* isolate,
-                                           PretenureFlag tenured);
-  Handle<String> AllocateInternalizedString(Isolate* isolate);
+  ParserSymbol* CurrentString(ParserSymbolTable* symbol_table);
+  ParserSymbol* NextString(ParserSymbolTable* symbol_table);
 
   double DoubleValue();
   bool UnescapedLiteralMatches(const char* data, int length) {