V10 [PATCH] x86: Support usable check for all CPU features

[Florian Weimer]

* H. J. Lu:

> EDX are checked.  Did you mean EAX/EBX from INDEX_1 and EAX from INDEX_7?
> They aren't used for CPU feature detection.

Could they be used in the future?  Then we should clear the usable view
of this.

Apart from this, I have no further comments.

Thanks,
Florian