ticket:10461: Andy's review comments.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35490 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10646: Andy's code review comments.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35491 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: A minor bug fix in utrace.c found during code review.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35493 251d0590-4201-4cf1-90de-194747b24ca1