x86/bitops: Move BIT_64() for a wider use

Needed for shifting 64-bit values on 32-bit, like MSR values,
for example.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frank Arnold <frank.arnold@amd.com>
Link: http://lkml.kernel.org/r/1337684026-19740-1-git-send-email-bp@amd64.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>