Return MaybeHandle from SetElement and DeleteElement.

src/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 360 matching lines @@
       if (m_literal->depth() + 1 > depth_acc) {
         depth_acc = m_literal->depth() + 1;
       }
     }
     Handle<Object> boilerplate_value = GetBoilerplateValue(element, isolate);
     if (boilerplate_value->IsTheHole()) {
       is_holey = true;
     } else if (boilerplate_value->IsUninitialized()) {
       is_simple = false;
       JSObject::SetOwnElement(
-          array, i, handle(Smi::FromInt(0), isolate), SLOPPY);
+          array, i, handle(Smi::FromInt(0), isolate), SLOPPY).Assert();
     } else {
-      JSObject::SetOwnElement(array, i, boilerplate_value, SLOPPY);
+      JSObject::SetOwnElement(array, i, boilerplate_value, SLOPPY).Assert();
     }
   }
 
   Handle<FixedArrayBase> element_values(array->elements());
 
   // Simple and shallow arrays can be lazily copied, we transform the
   // elements array to a copy-on-write array.
   if (is_simple && depth_acc == 1 && values()->length() > 0 &&
       array->HasFastSmiOrObjectElements()) {
     element_values->set_map(isolate->heap()->fixed_cow_array_map());
@@ skipping 781 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*value_)->value());
     str = arr;
   } else {
     str = DoubleToCString(value_->Number(), buffer);
   }
   return isolate_->factory()->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal