[patch] declare __clear_cache

[Rafael Espíndola]

>> I will update the patch to correct the builtin definition in clang too.
>
> Thanks for the offer; I've already corrected it though.

For 32 bits I mean :-) I have just emailed the patch. Current gcc's
produce an error on the incorrect definition, so it should be safe for
us to do the same.

> Tim.

Cheers,
Rafael