[stubs] Split ToNumberStub into reusable subparts.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 034e139e7e3596c1089533d2cb90a3caf59fe9c1..a788032d842c93668d10495c8f7aca0fef68f579 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -147,6 +147,18 @@ Callable CodeFactory::ToNumber(Isolate* isolate) {
 
 
 // static
+Callable CodeFactory::NonNumberToNumber(Isolate* isolate) {
+  NonNumberToNumberStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+// static
+Callable CodeFactory::StringToNumber(Isolate* isolate) {
+  StringToNumberStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+// static
 Callable CodeFactory::ToString(Isolate* isolate) {
   ToStringStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());