[turbofan] Add control input to Load and LoadElements.

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 78ead5e91b2f3026bb8793e86fed795ff1288e4d..9d07103469033b7feee73ebe34ef95c75a3fc80a 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -331,33 +331,30 @@ void JSGenericLowering::LowerJSInstanceOf(Node* node) {
 
 void JSGenericLowering::LowerJSLoadContext(Node* node) {
   const ContextAccess& access = ContextAccessOf(node->op());
-  // TODO(mstarzinger): Use simplified operators instead of machine operators
-  // here so that load/store optimization can be applied afterwards.
   for (size_t i = 0; i < access.depth(); ++i) {
     node->ReplaceInput(
         0, graph()->NewNode(
                machine()->Load(kMachAnyTagged),
                NodeProperties::GetValueInput(node, 0),
                Int32Constant(Context::SlotOffset(Context::PREVIOUS_INDEX)),
-               NodeProperties::GetEffectInput(node)));
+               NodeProperties::GetEffectInput(node), graph()->start()));
   }
   node->ReplaceInput(
       1, Int32Constant(Context::SlotOffset(static_cast<int>(access.index()))));
+  node->AppendInput(zone(), graph()->start());
   PatchOperator(node, machine()->Load(kMachAnyTagged));
 }
 
 
 void JSGenericLowering::LowerJSStoreContext(Node* node) {
   const ContextAccess& access = ContextAccessOf(node->op());
-  // TODO(mstarzinger): Use simplified operators instead of machine operators
-  // here so that load/store optimization can be applied afterwards.
   for (size_t i = 0; i < access.depth(); ++i) {
     node->ReplaceInput(
         0, graph()->NewNode(
                machine()->Load(kMachAnyTagged),
                NodeProperties::GetValueInput(node, 0),
                Int32Constant(Context::SlotOffset(Context::PREVIOUS_INDEX)),
-               NodeProperties::GetEffectInput(node)));
+               NodeProperties::GetEffectInput(node), graph()->start()));
   }
   node->ReplaceInput(2, NodeProperties::GetValueInput(node, 1));
   node->ReplaceInput(