ticket:9101: slightly shorter table lookup code

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34110 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: fast Latin only bail out for numeric=on if there are actually any digits

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34119 251d0590-4201-4cf1-90de-194747b24ca1