Simple merge of both thread_info_32.h and thread_info_64.h into thread_info.h.

Comments for #ifndef __ASM_THREAD_INFO_H and #ifdef __KERNEL__
are the same.
Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>