[WIP] NumberToString operator in TF.

src/compiler/js-typed-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-typed-lowering.h"
 
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
@@ skipping 941 matching lines @@
         common()->Select(MachineRepresentation::kTagged), input,
         jsgraph()->HeapConstant(factory()->true_string()),
         jsgraph()->HeapConstant(factory()->false_string())));
   }
   if (input_type->Is(Type::Undefined())) {
     return Replace(jsgraph()->HeapConstant(factory()->undefined_string()));
   }
   if (input_type->Is(Type::Null())) {
     return Replace(jsgraph()->HeapConstant(factory()->null_string()));
   }
-  // TODO(turbofan): js-typed-lowering of ToString(x:number)
+  if (input_type->Is(Type::Number())) {
+    return Replace(graph()->NewNode(simplified()->NumberToString(), input,
+                                    jsgraph()->Constant(10)));
+  }
   return NoChange();
 }
 
 
 Reduction JSTypedLowering::ReduceJSToString(Node* node) {
   // Try to reduce the input first.
   Node* const input = node->InputAt(0);
   Reduction reduction = ReduceJSToStringInput(input);
   if (reduction.Changed()) {
     ReplaceWithValue(node, reduction.replacement());
@@ skipping 1141 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8