kasan: use IS_ALIGNED in memory_is_poisoned_8()
kasan: use IS_ALIGNED in memory_is_poisoned_8()

Use IS_ALIGNED() to determine whether the shadow span two bytes.  It
generates less code and more readable.  Also add some comments in shadow
check functions.

Signed-off-by: Xishi Qiu <dd58e6c73de42ea3812c4e45cc983f071455d7f2@huawei.com>
Acked-by: Andrey Ryabinin <1db0f9e76dd8a9115570382660c6cd919b5a95b9@virtuozzo.com>
Cc: Andrey Konovalov <ab772008e8f06a56f3a2ad2afda8d60d557f23c3@gmail.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs