Remove bogus cast in LChunkBuilder::CreateEnvironment.

src/x64/lithium-x64.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 958 matching lines @@
   }
 
   if (needs_arguments_object_materialization) {
     HArgumentsObject* arguments = hydrogen_env->entry() == NULL
         ? graph()->GetArgumentsObject()
         : hydrogen_env->entry()->arguments_object();
     ASSERT(arguments->IsLinked());
     for (int i = 1; i < arguments->arguments_count(); ++i) {
       HValue* value = arguments->arguments_values()->at(i);
       ASSERT(!value->IsArgumentsObject() && !value->IsPushArgument());
-      ASSERT(HInstruction::cast(value)->IsLinked());
       LOperand* op = UseAny(value);
       result->AddValue(op,
                        value->representation(),
                        value->CheckFlag(HInstruction::kUint32));
     }
   }
 
   if (hydrogen_env->frame_type() == JS_FUNCTION) {
     *argument_index_accumulator = argument_index;
   }
@@ skipping 1614 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64