[stubs] Split ToNumberStub into reusable subparts.

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 1741 matching lines @@
 }
 
 Type* Typer::Visitor::TypeStringEqual(Node* node) { return Type::Boolean(); }
 
 Type* Typer::Visitor::TypeStringLessThan(Node* node) { return Type::Boolean(); }
 
 Type* Typer::Visitor::TypeStringLessThanOrEqual(Node* node) {
   return Type::Boolean();
 }
 
+Type* Typer::Visitor::TypeStringToNumber(Node* node) {
+  return TypeUnaryOp(node, ToNumber);
+}
 
 namespace {
 
 Type* ChangeRepresentation(Type* type, Type* rep, Zone* zone) {
   return Type::Union(Type::Semantic(type, zone),
                      Type::Representation(rep, zone), zone);
 }
 
 }  // namespace
 
@@ skipping 694 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