An unnecessary check for the range of a smi was being performed in

src/ia32/code-stubs-ia32.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 4721 matching lines @@
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
   __ cmp(ecx, edi);
   __ j(equal, &done);
   __ cmp(ecx, Immediate(TypeFeedbackCells::MegamorphicSentinel(isolate)));
   __ j(equal, &done);
 
   // Special handling of the Array() function, which caches not only the
   // monomorphic Array function but the initial ElementsKind with special
   // sentinels
-  Handle<Object> terminal_kind_sentinel =
-      TypeFeedbackCells::MonomorphicArraySentinel(isolate,
-                                                  LAST_FAST_ELEMENTS_KIND);
   __ JumpIfNotSmi(ecx, &miss);
-  __ cmp(ecx, Immediate(terminal_kind_sentinel));
-  __ j(above, &miss);
   // Load the global or builtins object from the current context
   __ LoadGlobalContext(ecx);
   // Make sure the function is the Array() function
   __ cmp(edi, Operand(ecx,
                       Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
   __ j(not_equal, &megamorphic);
   __ jmp(&done);
 
   __ bind(&miss);
 
@@ skipping 3331 matching lines @@
     __ jmp(generic_construct_stub, RelocInfo::CODE_TARGET);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32