[WIP] JSForInLowering and JSForInHasOwnProperty.

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 da4596a1ab01c000e38e3ebf601a508eae8919f2..7680810be71dd89d00eebc7207628878bb1c0700 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -593,16 +593,20 @@ void JSGenericLowering::LowerJSConvertReceiver(Node* node) {
   ReplaceWithRuntimeCall(node, Runtime::kConvertReceiver);
 }
 
+void JSGenericLowering::LowerJSForInHasOwnProperty(Node* node) {
+  UNREACHABLE();  // Eliminated in JSForInLowering.
+}
+
+void JSGenericLowering::LowerJSForInLoadProperty(Node* node) {
+  UNREACHABLE();  // Eliminated in JSForInLowering.
+}
+
 void JSGenericLowering::LowerJSForInNext(Node* node) {
-  CallDescriptor::Flags flags = FrameStateFlagForCall(node);
-  Callable callable = CodeFactory::ForInNext(isolate());
-  ReplaceWithStubCall(node, callable, flags);
+  UNREACHABLE();  // Eliminated in JSForInLowering.
 }
 
 void JSGenericLowering::LowerJSForInPrepare(Node* node) {
-  CallDescriptor::Flags flags = FrameStateFlagForCall(node);
-  Callable callable = CodeFactory::ForInPrepare(isolate());
-  ReplaceWithStubCall(node, callable, flags, node->op()->properties(), 3);
+  UNREACHABLE();  // Eliminated in JSForInLowering.
 }
 
 void JSGenericLowering::LowerJSLoadMessage(Node* node) {