ticket:10305: ensure that data converted to assembly language starts on a 16 byte boundary.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34075 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10318: add buffer length check to UTF-16/32 detector

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34076 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10250: fix an error in _getKeywords()

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34078 251d0590-4201-4cf1-90de-194747b24ca1