ticket:8464: Implement Andy's comments.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34891 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10574: initialize fCapitalizationContext in default constructor

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34897 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10574: Add basic C sanity check too

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34900 251d0590-4201-4cf1-90de-194747b24ca1