[turbofan] Pass NoContextConstant to stubs that don't need a context.

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 98 matching lines @@
       Linkage::GetRuntimeCallDescriptor(zone(), f, nargs, properties, flags);
   Node* ref = jsgraph()->ExternalConstant(ExternalReference(f, isolate()));
   Node* arity = jsgraph()->Int32Constant(nargs);
   node->InsertInput(zone(), 0, jsgraph()->CEntryStubConstant(fun->result_size));
   node->InsertInput(zone(), nargs + 1, ref);
   node->InsertInput(zone(), nargs + 2, arity);
   NodeProperties::ChangeOp(node, common()->Call(desc));
 }
 
 void JSGenericLowering::LowerJSStrictEqual(Node* node) {
+  // The === operator doesn't need the current context.
+  NodeProperties::ReplaceContextInput(node, jsgraph()->NoContextConstant());
   Callable callable = CodeFactory::StrictEqual(isolate());
   node->RemoveInput(4);  // control
   ReplaceWithStubCall(node, callable, CallDescriptor::kNoFlags,
                       Operator::kEliminatable);
 }
 
 void JSGenericLowering::LowerJSStrictNotEqual(Node* node) {
+  // The !== operator doesn't need the current context.
+  NodeProperties::ReplaceContextInput(node, jsgraph()->NoContextConstant());
   Callable callable = CodeFactory::StrictNotEqual(isolate());
   node->RemoveInput(4);  // control
   ReplaceWithStubCall(node, callable, CallDescriptor::kNoFlags,
                       Operator::kEliminatable);
 }
 
 void JSGenericLowering::LowerJSToBoolean(Node* node) {
+  // The ToBoolean conversion doesn't need the current context.
+  NodeProperties::ReplaceContextInput(node, jsgraph()->NoContextConstant());
   Callable callable = CodeFactory::ToBoolean(isolate());
   node->AppendInput(zone(), graph()->start());
   ReplaceWithStubCall(node, callable, CallDescriptor::kNoAllocate,
                       Operator::kEliminatable);
 }
 
 void JSGenericLowering::LowerJSTypeOf(Node* node) {
+  // The typeof operator doesn't need the current context.
+  NodeProperties::ReplaceContextInput(node, jsgraph()->NoContextConstant());
   Callable callable = CodeFactory::Typeof(isolate());
   node->AppendInput(zone(), graph()->start());
   ReplaceWithStubCall(node, callable, CallDescriptor::kNoAllocate,
                       Operator::kEliminatable);
 }
 
 
 void JSGenericLowering::LowerJSLoadProperty(Node* node) {
   Node* closure = NodeProperties::GetValueInput(node, 2);
   Node* effect = NodeProperties::GetEffectInput(node);
@@ skipping 532 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8