Move HAS_TRANSIENT_STATE flag into a safe area.

Previously, this flag conflicted with other text direction flags,
which can cause weird interactions across the View hierarchy,
specifically with ListView.

Also adds dumpFlags() utility to dump values of all know flags for
documentation and sanity checking.

Bug: 7189738
Change-Id: Iceb2f93f68a800e19a5889ced93abcce4932b067