Calls to HCheckFunction can be eliminated if the value is an HConstant

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4227b8ee067531a4dae5a6c7d4dc21cea5f46dac..0cd2f874259ad72e95094822bf3515c0d33bbdc8 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2838,6 +2838,8 @@ class HCheckFunction: public HUnaryOperation {
   virtual void PrintDataTo(StringStream* stream);
   virtual HType CalculateInferredType();
 
+  virtual HValue* Canonicalize();
+
 #ifdef DEBUG
   virtual void Verify();
 #endif
@@ -3411,6 +3413,11 @@ class HConstant: public HTemplateInstruction<0> {
     }
   }
 
+  bool UniqueValueIdsMatch(UniqueValueId other) {
+    if (!has_double_value_) return unique_id_ == other;
+    return false;
+  }
+
 #ifdef DEBUG
   virtual void Verify() { }
 #endif