ticket:10810: genrb: preflight strings on final parse tree, not while building the tree

git-svn-id: http://source.icu-project.org/repos/icu/icu@35544 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8550 CJK Dictionary break fixes, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35547 251d0590-4201-4cf1-90de-194747b24ca1