mm: init: report on last-nid information stored in page->flags

mm: init: report on last-nid information stored in page->flags

Answering the question "how much space remains in the page->flags" is
time-consuming.  mminit_loglevel can help answer the question but it does
not take last_nid information into account.  This patch corrects it and
while there it corrects the messages related to page flag usage, pgshifts
and node/zone id.  When applied the relevant output looks something like
this but will depend on the kernel configuration.

[    0.000000] mminit::pageflags_layout_widths Section 0 Node 9 Zone 2 Lastnid 9 Flags 25
[    0.000000] mminit::pageflags_layout_shifts Section 19 Node 9 Zone 2 Lastnid 9
[    0.000000] mminit::pageflags_layout_pgshifts Section 0 Node 55 Zone 53 Lastnid 44
[    0.000000] mminit::pageflags_layout_nodezoneid Node/Zone ID: 64 -> 53
[    0.000000] mminit::pageflags_layout_usage location: 64 -> 44 layout 44 -> 25 unused 25 -> 0 page-flags

Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>