[turbofan] Remove special JSForInStep and JSForInDone.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 69526cd7eae8d43227c820e3842c05c01c7377e2..9cbeea9fcc8e241ec78a6eae09c97e60662688dd 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -574,11 +574,6 @@ void JSGenericLowering::LowerJSCallRuntime(Node* node) {
 }
 
 
-void JSGenericLowering::LowerJSForInDone(Node* node) {
-  ReplaceWithRuntimeCall(node, Runtime::kForInDone);
-}
-
-
 void JSGenericLowering::LowerJSForInNext(Node* node) {
   ReplaceWithRuntimeCall(node, Runtime::kForInNext);
 }
@@ -588,12 +583,6 @@ void JSGenericLowering::LowerJSForInPrepare(Node* node) {
   ReplaceWithRuntimeCall(node, Runtime::kForInPrepare);
 }
 
-
-void JSGenericLowering::LowerJSForInStep(Node* node) {
-  ReplaceWithRuntimeCall(node, Runtime::kForInStep);
-}
-
-
 void JSGenericLowering::LowerJSLoadMessage(Node* node) {
   ExternalReference message_address =
       ExternalReference::address_of_pending_message_obj(isolate());