- Update to r330538.
- Turn off mixed mode for HotSpot (i. e., JIT compiler) by default for
extreme safety. Although it may be too conservative and/or slow, it is okay
because it is not useful for anything but bootstrapping OpenJDK itself. In
fact, it does not seem stable within jails (e. g., QAT) for unknown reasons.
- Revert r330422. Now it is obsolete by r330500.