[PATCH][v2] PPC: use CURRENT_THREAD_INFO instead of open coded assembly

[Benjamin Herrenschmidt]

On Mon, 2012-07-02 at 16:14 -0500, Stuart Yoder wrote:
> -v2
>    -moved CURRENT_THREAD_INFO under assembly only
>     #ifdef 

Nak, invert the two cases to avoid the if_n_def, but don't move it
inside __ASSEMBLY__ only.

IE. Address Alex other comment :-)

Cheers,
Ben.