I would advise to not use EA with HS16.
Vladimir Kozlov has advised that changes from hs16 should not be merged due to two EA critical bugs in the build.
These bugs mean that during escape analysis the generated code produces NULL(0) instead of the expected (stored) values.
“I would advise to not use EA with HS16,” he writes.
In 6u21 the default flag's value is set to false, but it can be specified on command line to enable EA. “There are few problems which needs to be fixed before we enable EA by default,” he concludes.