Revert "Convert UnaryOpStub to a HydrogenCodeStub"

src/x64/full-codegen-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 4335 matching lines @@
     default:
       UNREACHABLE();
   }
 }
 
 
 void FullCodeGenerator::EmitUnaryOperation(UnaryOperation* expr,
                                            const char* comment) {
   // TODO(svenpanne): Allowing format strings in Comment would be nice here...
   Comment cmt(masm_, comment);
-  UnaryOpStub stub(expr->op());
+  bool can_overwrite = expr->expression()->ResultOverwriteAllowed();
+  UnaryOverwriteMode overwrite =
+      can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
+  UnaryOpStub stub(expr->op(), overwrite);
   // UnaryOpStub expects the argument to be in the
   // accumulator register rax.
   VisitForAccumulatorValue(expr->expression());
   SetSourcePosition(expr->position());
   CallIC(stub.GetCode(isolate()), RelocInfo::CODE_TARGET,
          expr->UnaryOperationFeedbackId());
   context()->Plug(rax);
 }
 
 
@@ skipping 536 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64