Return Object* instead of MaybeObject* from runtime calls.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 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 1864 matching lines @@
     __ bind(&handler_entry);
     handler_offset_ = handler_entry.pos();
     // Caught exception: Store result (exception) in the pending exception
     // field in the JSEnv and return a failure sentinel. Coming in here the
     // fp will be invalid because the PushTryHandler below sets it to 0 to
     // signal the existence of the JSEntry frame.
     __ Mov(x10, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
            isolate)));
   }
   __ Str(code_entry, MemOperand(x10));
-  __ Mov(x0, Operand(reinterpret_cast<int64_t>(Failure::Exception())));
+  __ LoadRoot(x0, Heap::kExceptionRootIndex);
   __ B(&exit);
 
   // Invoke: Link this frame into the handler chain.  There's only one
   // handler block in this code object, so its index is 0.
   __ Bind(&invoke);
   __ PushTryHandler(StackHandler::JS_ENTRY, 0);
   // If an exception not caught by another handler occurs, this handler
   // returns control to the code after the B(&invoke) above, which
   // restores all callee-saved registers (including cp and fp) to their
   // saved values before returning a failure to C.
@@ skipping 3628 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64