[turbofan] Combine family of CallRuntime() methods into single imeplementation.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index e8f2b79eedec5b3b97b8d910f5f956f2a4f7ce0a..bf6485e5dcb6961787e286004db7cb87f04ad459 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -22,6 +22,12 @@ Callable make_callable(Stub& stub) {
 }  // namespace
 
 // static
+Handle<Code> CodeFactory::RuntimeCEntry(Isolate* isolate, int result_size) {
+  CEntryStub stub(isolate, result_size);
+  return stub.GetCode();
+}
+
+// static
 Callable CodeFactory::LoadIC(Isolate* isolate) {
   LoadICTrampolineStub stub(isolate);
   return make_callable(stub);