[turbofan] Remove phase ordering problem in JSToNumber lowering.

src/compiler/typer.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/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1827 matching lines @@
 
 namespace {
 
 Type* ChangeRepresentation(Type* type, Type* rep, Zone* zone) {
   return Type::Union(Type::Semantic(type, zone),
                      Type::Representation(rep, zone), zone);
 }
 
 }  // namespace
 
+Type* Typer::Visitor::TypeChangeTaggedSignedToWord32(Node* node) {
+  Type* arg = Operand(node, 0);
+  // TODO(neis): DCHECK(arg->Is(Type::Signed32()));
+  return ChangeRepresentation(arg, Type::UntaggedIntegral32(), zone());
+}
 
 Type* Typer::Visitor::TypeChangeTaggedToInt32(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(neis): DCHECK(arg->Is(Type::Signed32()));
   return ChangeRepresentation(arg, Type::UntaggedIntegral32(), zone());
 }
 
 
 Type* Typer::Visitor::TypeChangeTaggedToUint32(Node* node) {
   Type* arg = Operand(node, 0);
@@ skipping 697 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8