[PATCH] Teach X86 builtins which target features they require

[Eric Christopher]

Thank you for the somewhat ridiculous amount of typing there :)

Might need some changes when I use it, but obviously having the information
there is better than not so LGTM :)

-eric

On Mon, Aug 3, 2015 at 3:08 PM Justin Bogner <mail at justinbogner.com> wrote:

> This adds the required target feature names to x86 builtins that need
> particular features. Most have exactly one ("avx", "aes", etc), but some
> of the avx512 features have multiple requirements, eg "avx512vl,avx512bw".
>
> Eric: this should be what you need to implement the warning for using
> functions with unsatisfied target requirements for builtins.
>
>
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