[PATCH] Use 'override/final' instead of 'virtual' for overridden methods

[Alexander Kornienko]

In http://reviews.llvm.org/D8925#153913, @craig.topper wrote:

> A lot of these seem to be destructors. Do we really want override on
>  destructors? It's sort of implicit when the class isn't a base class.


Destructors are not much different from other methods in this regard: when you forget to specify `virtual` on the base class destructor, `override` on the derived one's will make compiler complain. Without `override` the code will compile fine, but will do something wrong.


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http://reviews.llvm.org/D8925

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