More cleanup to avoid creation of redundant handles

runtime/vm/parser.h

Index: runtime/vm/parser.h
===================================================================
--- runtime/vm/parser.h	(revision 23418)
+++ runtime/vm/parser.h	(working copy)
@@ -17,6 +17,7 @@
 
 // Forward declarations.
 class Function;
+class LiteralToken;
 class Script;
 class TokenStream;
 
@@ -645,6 +646,9 @@
   // The function currently being parsed.
   Function& innermost_function_;
 
+  // Current literal token.
+  LiteralToken& literal_token_;
+
   // The class currently being parsed, or the owner class of the
   // function currently being parsed. It is used for primary identifier lookups.
   Class& current_class_;