Dust off and fix DUMP_NODE_STATISTICS

This patch updates DUMP_NODE_STATISTICS as it has gotten stale.
Attributes are no longer lazily created so those counts have been
removed. Clang does not allow exit time destructors so the static
liveNodeSet() function has been added. Lastly, fix a few type errors.

Review URL: https://codereview.chromium.org/310433002

git-svn-id: svn://svn.chromium.org/blink/trunk@175150 bbb929c8-8fbe-4397-9dbb-9b2b20218538