Stop using plain Arrays internally in built-in functions.

src/x64/builtins-x64.cc

 // Copyright 2011 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 1230 matching lines @@
   //  -- rax : argc
   //  -- rsp[0] : return address
   //  -- rsp[8] : last argument
   // -----------------------------------
   Label generic_array_code;
 
   // Get the Array function.
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rdi);
 
   if (FLAG_debug_code) {
-    // Initial map for the builtin Array function shoud be a map.
+    // Initial map for the builtin Array functions should be maps.
     __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
     ASSERT(kSmiTag == 0);
     Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
     __ Check(not_smi, "Unexpected initial map for Array function");
     __ CmpObjectType(rbx, MAP_TYPE, rcx);
     __ Check(equal, "Unexpected initial map for Array function");
   }
 
   // Run the native code for the Array function called as a normal function.
@@ skipping 221 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64