[compiler] Remove dead code from js-generic-lowering.

src/compiler/js-generic-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-generic-lowering.h"
 
 #include "src/ast/ast.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
@@ skipping 268 matching lines @@
   ReplaceWithStubCall(node, callable, flags);
 }
 
 void JSGenericLowering::LowerJSOrdinaryHasInstance(Node* node) {
   CallDescriptor::Flags flags = FrameStateFlagForCall(node);
   Callable callable = CodeFactory::OrdinaryHasInstance(isolate());
   ReplaceWithStubCall(node, callable, flags);
 }
 
 void JSGenericLowering::LowerJSLoadContext(Node* node) {
-  const ContextAccess& access = ContextAccessOf(node->op());
-  for (size_t i = 0; i < access.depth(); ++i) {
-    node->ReplaceInput(
-        0, graph()->NewNode(machine()->Load(MachineType::AnyTagged()),
-                            NodeProperties::GetValueInput(node, 0),
-                            jsgraph()->Int32Constant(
-                                Context::SlotOffset(Context::PREVIOUS_INDEX)),
-                            NodeProperties::GetEffectInput(node),
-                            graph()->start()));
-  }
-  node->ReplaceInput(1, jsgraph()->Int32Constant(Context::SlotOffset(
-                            static_cast<int>(access.index()))));
-  node->AppendInput(zone(), graph()->start());
-  NodeProperties::ChangeOp(node, machine()->Load(MachineType::AnyTagged()));
+  UNREACHABLE();  // Eliminated in typed lowering.
 }
 
 
 void JSGenericLowering::LowerJSStoreContext(Node* node) {
-  const ContextAccess& access = ContextAccessOf(node->op());
-  for (size_t i = 0; i < access.depth(); ++i) {
-    node->ReplaceInput(
-        0, graph()->NewNode(machine()->Load(MachineType::AnyTagged()),
-                            NodeProperties::GetValueInput(node, 0),
-                            jsgraph()->Int32Constant(
-                                Context::SlotOffset(Context::PREVIOUS_INDEX)),
-                            NodeProperties::GetEffectInput(node),
-                            graph()->start()));
-  }
-  node->ReplaceInput(2, NodeProperties::GetValueInput(node, 1));
-  node->ReplaceInput(1, jsgraph()->Int32Constant(Context::SlotOffset(
-                            static_cast<int>(access.index()))));
-  NodeProperties::ChangeOp(
-      node, machine()->Store(StoreRepresentation(MachineRepresentation::kTagged,
-                                                 kFullWriteBarrier)));
+  UNREACHABLE();  // Eliminated in typed lowering.
 }
 
 
 void JSGenericLowering::LowerJSCreate(Node* node) {
   CallDescriptor::Flags flags = FrameStateFlagForCall(node);
   Callable callable = CodeFactory::FastNewObject(isolate());
   ReplaceWithStubCall(node, callable, flags);
 }
 
 
@@ skipping 305 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8