Step toward eliminating increment nodes, starting with increment local. Fix a bug in evaluating sid…

runtime/vm/parser.h

Index: runtime/vm/parser.h
===================================================================
--- runtime/vm/parser.h	(revision 7298)
+++ runtime/vm/parser.h	(working copy)
@@ -467,6 +467,7 @@
   void CheckFunctionIsCallable(intptr_t token_index, const Function& function);
   void CheckOperatorArity(const MemberDesc& member, Token::Kind operator_token);
 
+  const LocalVariable& GetIncrementTempLocal();
 
   const Script& script_;
   const TokenStream& tokens_;
@@ -501,6 +502,9 @@
   // done using 'return', 'break' or 'continue' statements.
   TryBlocks* try_blocks_list_;
 
+  // Allocate temporary only once per function.
+  LocalVariable* increment_temp_;
+
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };