sleeping in atomic: add some new checks to warn about sleeping in atomic

sleeping in atomic: add some new checks to warn about sleeping in atomic

This check has quite a few parts the track different information and then
the check to print the warnings is just one file.

1) check_preempt_info.c:  This tracks if a function increments or
        decrements the preempt count.  It only stores return states
        not caller info.  It only tracks "simple" functions.  If a function
        increments the preempt count and then decrements it again that is
        marked is &ignore.
2) check_preempt.c:  This uses check_preempt_info.c and inserts caller_info
        data when a function is called with preempt disabled.
3) check_sleep_info.c:  This tracks which functions *always* sleep.  If
        they only sleep on some occasions that doesn't generate useful
        warnings.
4) check_scheduling_in_atomic.c:  This prints the warning if we sleep
        in atomic context.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>