Fix: use struct reclaim_stat in mm_vmscan_lru_shrink_inactive for 4.17

Fix: use struct reclaim_stat in mm_vmscan_lru_shrink_inactive for 4.17

See upstream commit:

  commit d51d1e64500fcb48fc6a18c77c965b8f48a175f2
  Author: Steven Rostedt <rostedt@goodmis.org>
  Date:   Tue Apr 10 16:28:07 2018 -0700

    mm, vmscan, tracing: use pointer to reclaim_stat struct in trace event

    The trace event trace_mm_vmscan_lru_shrink_inactive() currently has 12
    parameters! Seven of them are from the reclaim_stat structure.  This
    structure is currently local to mm/vmscan.c.  By moving it to the global
    vmstat.h header, we can also reference it from the vmscan tracepoints.
    In moving it, it brings down the overhead of passing so many arguments
    to the trace event.  In the future, we may limit the number of arguments
    that a trace event may pass (ideally just 6, but more realistically it
    may be 8).

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>