Implement clearing of CompareICs.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 56625525d472c9e633b55a124eb468c5ca6dccef..a822927c4ff399a9e17e8a10384ddb31cb5607eb 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -794,6 +794,9 @@ class CompareIC: public IC {
   // Helper function for determining the state of a compare IC.
   static State ComputeState(Code* target);
 
+  // Helper function for determining the operation a compare IC is for.
+  static Token::Value ComputeOperation(Code* target);
+
   static const char* GetStateName(State state);
 
  private:
@@ -804,7 +807,13 @@ class CompareIC: public IC {
   Condition GetCondition() const { return ComputeCondition(op_); }
   State GetState() { return ComputeState(target()); }
 
+  static Code* initialize_stub(Token::Value op);
+
+  static void Clear(Address address, Code* target);
+
   Token::Value op_;
+
+  friend class IC;
 };
 
 
@@ -817,7 +826,8 @@ class ToBooleanIC: public IC {
 
 
 // Helper for BinaryOpIC and CompareIC.
-void PatchInlinedSmiCode(Address address);
+enum InlinedSmiCheck { ENABLE_INLINED_SMI_CHECK, DISABLE_INLINED_SMI_CHECK };
+void PatchInlinedSmiCode(Address address, InlinedSmiCheck check);
 
 } }  // namespace v8::internal