From: Jeff Dike <jdike@addtoit.com>

Add an empty asm/irqflags.h, which seems to satisfy the lock validator enough
that UML builds.
Signed-off-by: NJeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>