[turbofan] Some more cleanup on the intrinsics.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index d30365220176d526e1bdbd8509710413f85e55ab..8d7eddc1242c83e025a9c788e5a9be4492becc42 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -197,6 +197,13 @@ Callable CodeFactory::RegExpConstructResult(Isolate* isolate) {
 
 
 // static
+Callable CodeFactory::RegExpExec(Isolate* isolate) {
+  RegExpExecStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+
+// static
 Callable CodeFactory::StringAdd(Isolate* isolate, StringAddFlags flags,
                                 PretenureFlag pretenure_flag) {
   StringAddStub stub(isolate, flags, pretenure_flag);
@@ -212,6 +219,13 @@ Callable CodeFactory::StringCompare(Isolate* isolate) {
 
 
 // static
+Callable CodeFactory::SubString(Isolate* isolate) {
+  SubStringStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+
+// static
 Callable CodeFactory::Typeof(Isolate* isolate) {
   TypeofStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());