commit cd4d09ec upstream.

Move them to a separate header and have the following
dependency:

  x86/cpufeatures.h <- x86/processor.h <- x86/cpufeature.h

This makes it easier to use the header in asm code and not
include the whole cpufeature.h and add guards for asm.

Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1453842730-28463-5-git-send-email-bp@alien8.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>
[bwh: Backported to 3.16 to avoid a dependency loop:
 - Drop some inapplicable changes
 - Move all the previously backported feature and bug flags across
 - Also change <asm/nospec-branch.h> and lib/retpoline.S to use
   <asm/cpufeatures.h>
 - Also include <asm/cpufeatures.h> in <asm/barrier.h>, as the vdso fails to
   build without that
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>