include/linux/mmdebug.h: add VM_WARN which maps to WARN()

include/linux/mmdebug.h: add VM_WARN which maps to WARN()

This enables us to do VM_WARN(condition, "warn message");

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Aneesh Kumar K.V <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>