mkfs.cramfs: fix unsigned integer overflow [AddressSanitizer]

The original_size should be in 512 bytes blocks but it isn't while the
new_size is using 512 bytes blocks.  When original_size size is smaller
then 512 the new_size grows rather than shrinks, what one usually would
expect after data compression.  See also TODO comment near the change.

disk-utils/mkfs.cramfs.c:622:20: runtime error: unsigned integer
overflow: 64 - 512 cannot be represented in type 'unsigned long'

Reference: http://www.spinics.net/lists/util-linux-ng/msg10630.html
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
include/c: define UL_ASAN_BLACKLIST address_sanitizer function attribute

The UL_ASAN_BLACKLIST allows AddressSanitizer to be set off for functions
that cannot be checked.

Reference: http://dxr.mozilla.org/mozilla-central/source/mfbt/Attributes.h
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
lscpu: blacklist vmware_bdoor() AddressSanitizer check

AddressSanitizer is identifying the __asm__ segment as suspicious.

==1215==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000
(pc 0x0000004ccffd bp 0x7fff9b7184f0 sp 0x7fff9b7184e0 T0)
    #0 0x4ccffc in vmware_bdoor /home/src/util-linux/sys-utils/lscpu.c:660

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
ipcs: fix two data type errors [AddressSanitizer]

==3218==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffa577e2b0 at pc 0x4501f9 bp 0x7fffa577e130 sp 0x7fffa577e108
WRITE of size 112 at 0x7fffa577e2b0 thread T0
    #0 0x4501f8 in shmctl /home/users/aadgrand/LLVM/releases/ubuntu/final/llvm.src/projects/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:2502
    #1 0x48bd13 in ipc_shm_get_info /home/travis/build/kerolasa/lelux-utiliteetit/sys-utils/ipcutils.c:157
    #2 0x488884 in do_shm /home/travis/build/kerolasa/lelux-utiliteetit/sys-utils/ipcs.c:279
    #3 0x4844a8 in main /home/travis/build/kerolasa/lelux-utiliteetit/sys-utils/ipcs.c:175
    #4 0x2afb3f8c176c (/lib/x86_64-linux-gnu/libc.so.6+0x2176c)
    #5 0x48408c in _start (/home/travis/build/kerolasa/lelux-utiliteetit/ipcs+0x48408c)

Signed-off-by: Sami Kerola <kerolasa@iki.fi>