Allow monomorphic loads when static type is known.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 9c808c78f2e74e5f94649a5e0b9b369d82b38607..4a6709bf445459e576afe2c011137cdfb5ed9364 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -571,6 +571,11 @@ void HValue::PrintNameTo(StringStream* stream) {
 }
 
 
+bool HValue::HasMonomorphicJSObjectType() {
+  return !GetMonomorphicJSObjectMap().is_null();
+}
+
+
 bool HValue::UpdateInferredType() {
   HType type = CalculateInferredType();
   bool result = (!type.Equals(type_));