Use same JRUBY_OPTS as on Travis CI if not set

Author: bf4

travis/script/functions.sh

@@ -2,6 +2,8 @@ SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source $SCRIPT_DIR/travis_functions.sh
 source $SCRIPT_DIR/predicate_functions.sh
 
+# If JRUBY_OPTS isn't set, use these.
+export JRUBY_OPTS=${JRUBY_OPTS:-"--server -Xcompile.invokedynamic=false"}
 # idea taken from: http://blog.headius.com/2010/03/jruby-startup-time-tips.html
 export JRUBY_OPTS="${JRUBY_OPTS} -X-C" # disable JIT since these processes are so short lived
 SPECS_HAVE_RUN_FILE=specs.out