Remove RETURN_RESULT macro

src/builtins/builtins-regexp.cc

Index: src/builtins/builtins-regexp.cc
diff --git a/src/builtins/builtins-regexp.cc b/src/builtins/builtins-regexp.cc
index fa7241941d7cc90d7a42025b405aa5f664657fd6..1e3f1844beeb0ccc803bba3f20dc8551d1764ce2 100644
--- a/src/builtins/builtins-regexp.cc
+++ b/src/builtins/builtins-regexp.cc
@@ -60,9 +60,7 @@ MaybeHandle<JSRegExp> RegExpInitialize(Isolate* isolate,
   }
 
   // TODO(jgruber): We could avoid the flags back and forth conversions.
-  RETURN_RESULT(isolate,
-                JSRegExp::Initialize(regexp, pattern_string, flags_string),
-                JSRegExp);
+  return JSRegExp::Initialize(regexp, pattern_string, flags_string);
 }
 
 }  // namespace