In order to test a JRE (or any of the compact Profiles) then it requires specifying a compilejdk to jtreg. Unfortunately this doesn't work with our shell tests because they often invoke javac on the TESTJAVA rather than the COMPILEJAVA.

Note that the scope of this enhancement is the tests that are candidates to run on compact profiles only, there are many other shell tests that could also be updated but not as part of this issue.