Track whether a node or variable are likely to be a Smi value. Propagate that...

src/codegen-ia32.h

Index: src/codegen-ia32.h
===================================================================
--- src/codegen-ia32.h	(revision 629)
+++ src/codegen-ia32.h	(working copy)
@@ -238,7 +238,12 @@
   Label* true_target() const  { return state_->true_target(); }
   Label* false_target() const  { return state_->false_target(); }
 
+  // Track loop nesting level.
+  int loop_nesting() const { return loop_nesting_; }
+  void IncrementLoopNesting() { loop_nesting_++; }
+  void DecrementLoopNesting() { loop_nesting_--; }
 
+
   // Node visitors.
 #define DEF_VISIT(type) \
   void Visit##type(type* node);
@@ -287,6 +292,7 @@
   void ToBoolean(Label* true_target, Label* false_target);
 
   void GenericBinaryOperation(Token::Value op,
+      StaticType* type,
       const OverwriteMode overwrite_mode = NO_OVERWRITE);
 
   void Comparison(Condition cc, bool strict = false);
@@ -297,6 +303,7 @@
   bool IsInlineSmi(Literal* literal);
   void SmiComparison(Condition cc,  Handle<Object> value, bool strict = false);
   void SmiOperation(Token::Value op,
+                    StaticType* type,
                     Handle<Object> value,
                     bool reversed,
                     OverwriteMode overwrite_mode);
@@ -412,6 +419,7 @@
   CodeGenState* state_;
   bool is_inside_try_;
   int break_stack_height_;
+  int loop_nesting_;
 
   // Labels
   Label function_return_;