[compiler] Introduce StringEqualStub and StringNotEqualStub.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 56dd5bace92100c568565692b3e27ed3e9c33f8e..173f06e17160ae7a8703aa6c0e161dbeab53bf8b 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -220,6 +220,17 @@ Callable CodeFactory::StringCompare(Isolate* isolate) {
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
+// static
+Callable CodeFactory::StringEqual(Isolate* isolate) {
+  StringEqualStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+// static
+Callable CodeFactory::StringNotEqual(Isolate* isolate) {
+  StringNotEqualStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
 
 // static
 Callable CodeFactory::SubString(Isolate* isolate) {