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 5a9510f8e31349117533232d5a4eca93263ecdda..e99f90920a9ac6cf4f252ab3472217e424247d5f 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1690,6 +1690,14 @@ 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";