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

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 5ba4298c229b6726d7041a51778f7b2de0211da0..e837af1ab932a81d8d6abc60d954ef1de197b45c 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1690,14 +1690,6 @@ void HCheckFunction::PrintDataTo(StringStream* stream) {
 }
 
 
-HValue* HCheckFunction::Canonicalize() {
-  return (value()->IsConstant() &&
-          HConstant::cast(value())->UniqueValueIdsMatch(target_unique_id_))
-      ? NULL
-      : this;
-}
-
-
 const char* HCheckInstanceType::GetCheckName() {
   switch (check_) {
     case IS_SPEC_OBJECT: return "object";