Reduce boilerplace for common pattern to return MaybeHandle.

src/runtime/runtime-forin.cc

Index: src/runtime/runtime-forin.cc
diff --git a/src/runtime/runtime-forin.cc b/src/runtime/runtime-forin.cc
index 4b558d124f5db765d3c51d9b7a20ee934019224f..1799b339e6b1b5c07406136dd29f6fb1af358ef0 100644
--- a/src/runtime/runtime-forin.cc
+++ b/src/runtime/runtime-forin.cc
@@ -107,9 +107,7 @@ RUNTIME_FUNCTION(Runtime_ForInEnumerate) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  Handle<HeapObject> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, Enumerate(receiver));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate, Enumerate(receiver));
 }
 
 
@@ -159,9 +157,7 @@ RUNTIME_FUNCTION(Runtime_ForInFilter) {
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, Filter(receiver, key));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate, Filter(receiver, key));
 }
 
 
@@ -177,9 +173,7 @@ RUNTIME_FUNCTION(Runtime_ForInNext) {
   if (receiver->map() == *cache_type) {
     return *key;
   }
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, Filter(receiver, key));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate, Filter(receiver, key));
 }