Add a compare stub on ARM.

src/arm/simulator-arm.cc

 // Copyright 2009 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 1028 matching lines @@
               "Call to host function at %p with args %08x, %08x, %08x, %08x\n",
               FUNCTION_ADDR(target),
               arg0,
               arg1,
               arg2,
               arg3);
         }
         int64_t result = target(arg0, arg1, arg2, arg3);
         int32_t lo_res = static_cast<int32_t>(result);
         int32_t hi_res = static_cast<int32_t>(result >> 32);
+        if (::v8::internal::FLAG_trace_sim) {
+          PrintF("Returned %08x\n", lo_res);
+        }
         set_register(r0, lo_res);
         set_register(r1, hi_res);
         set_register(r0, result);
       }
       set_register(lr, saved_lr);
       set_pc(get_register(lr));
       break;
     }
     case break_point: {
       Debugger dbg(this);
@@ skipping 695 matching lines @@
   set_register(r10, r10_val);
   set_register(r11, r11_val);
 
   int result = get_register(r0);
   return reinterpret_cast<Object*>(result);
 }
 
 } }  // namespace assembler::arm
 
 #endif  // !defined(__arm__)