The _TIF_ALLWORK_MASK macro automatically includes the least-significant
16 bits of the thread_info flags, which is less than obvious and tends
to create confusion and surprises when reading or modifying the code.

Define the flags explicitly.
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: NPetr Mladek <pmladek@suse.com>
Reviewed-by: NMiroslav Benes <mbenes@suse.cz>
Reviewed-by: NKamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>        # for the x86 changes
Signed-off-by: NJiri Kosina <jkosina@suse.cz>