Reduce boilerplace for common pattern to return MaybeHandle.

src/runtime/runtime-json.cc

Index: src/runtime/runtime-json.cc
diff --git a/src/runtime/runtime-json.cc b/src/runtime/runtime-json.cc
index d953eeb40425b9fc4fd80a84b90eb074d721c8a8..576e5400927d1cf37c56fa68b70f96aa305bdf24 100644
--- a/src/runtime/runtime-json.cc
+++ b/src/runtime/runtime-json.cc
@@ -18,10 +18,8 @@ RUNTIME_FUNCTION(Runtime_QuoteJSONString) {
   HandleScope scope(isolate);
   CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
   DCHECK(args.length() == 1);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, BasicJsonStringifier::StringifyString(isolate, string));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(
+      isolate, BasicJsonStringifier::StringifyString(isolate, string));
 }
 
 RUNTIME_FUNCTION(Runtime_BasicJSONStringify) {
@@ -29,10 +27,8 @@ RUNTIME_FUNCTION(Runtime_BasicJSONStringify) {
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, gap, 1);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, BasicJsonStringifier(isolate).Stringify(object, gap));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(
+      isolate, BasicJsonStringifier(isolate).Stringify(object, gap));
 }
 
 RUNTIME_FUNCTION(Runtime_ParseJson) {
@@ -44,12 +40,9 @@ RUNTIME_FUNCTION(Runtime_ParseJson) {
                                      Object::ToString(isolate, object));
   source = String::Flatten(source);
   // Optimized fast case where we only have Latin1 characters.
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                     source->IsSeqOneByteString()
-                                         ? JsonParser<true>::Parse(source)
-                                         : JsonParser<false>::Parse(source));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate, source->IsSeqOneByteString()
+                                        ? JsonParser<true>::Parse(source)
+                                        : JsonParser<false>::Parse(source));
 }
 
 }  // namespace internal