Hydrogen: fix keyed loads with string keys

src/typing.cc

Index: src/typing.cc
diff --git a/src/typing.cc b/src/typing.cc
index 1cfaf64f64a403e4a44b035c889c091625ac0592..5376309d69d71b931d0b9a906c29816c853c796f 100644
--- a/src/typing.cc
+++ b/src/typing.cc
@@ -494,9 +494,11 @@ void AstTyper::VisitProperty(Property* expr) {
       oracle()->PropertyReceiverTypes(id, name, expr->GetReceiverTypes());
     } else {
       bool is_string;
+      IcCheckType key_type;
       oracle()->KeyedPropertyReceiverTypes(
-          id, expr->GetReceiverTypes(), &is_string);
+          id, expr->GetReceiverTypes(), &is_string, &key_type);
       expr->set_is_string_access(is_string);
+      expr->set_key_type(key_type);
     }
   }