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Adding a --test-junit-coverage-jvm-options flag that allows specifying JVM options for the processes that run the test coverage tools.

Cobertura's "instrument" target runs out of PermGen space when it needs to process a target with a larger number of files, and currently there's no way to increase the default (512M).

Testing Done:
Tested the change on a Twitter target that failed with the default options, and passed with --test-junit-coverage-jvm-options=-Xmx4g --test-junit-coverage-jvm-options=-XX:MaxPermSize=1g

build-support/bin/ci.sh passed.

Reviewed at https://rbcommons.com/s/twitter/r/1968/

7 of 7 new or added lines in 1 file covered. (100.0%)

12729 of 18334 relevant lines covered (69.43%)

0.69 hits per line