[turbofan] Fix cycles introduced by pushing ToNumbers into phis.

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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 214 matching lines @@
 
 void JSGenericLowering::LowerJSToBoolean(Node* node) {
   Callable callable =
       CodeFactory::ToBoolean(isolate(), ToBooleanStub::RESULT_AS_ODDBALL);
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
 }
 
 
 void JSGenericLowering::LowerJSToNumber(Node* node) {
   Callable callable = CodeFactory::ToNumber(isolate());
+  // TODO(mstarzinger): Embedding the context this way prevents sharing of code
+  // across native contexts.
+  if (!info_context_constant_.is_set()) {
+    info_context_constant_.set(jsgraph()->HeapConstant(info()->context()));
+  }
+  node->ReplaceInput(1, info_context_constant_.get());
   ReplaceWithStubCall(node, callable, FlagsForNode(node));
 }
 
 
 void JSGenericLowering::LowerJSToString(Node* node) {
   ReplaceWithBuiltinCall(node, Builtins::TO_STRING, 1);
 }
 
 
 void JSGenericLowering::LowerJSToObject(Node* node) {
@@ skipping 174 matching lines @@
 
 
 void JSGenericLowering::LowerJSCallRuntime(Node* node) {
   const CallRuntimeParameters& p = CallRuntimeParametersOf(node->op());
   ReplaceWithRuntimeCall(node, p.id(), static_cast<int>(p.arity()));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8