RFR: 8211138: Missing Flag enum constants

[Liam Miller-Cushon]

On Mon, Sep 24, 2018 at 8:29 AM Maurizio Cimadamore <
maurizio.cimadamore at oracle.com> wrote:

> Which leaves out ANONCONSTR_BASED and POTENTIALLY_AMBIGUOUS, which
> should indeed be added to avoid spurious assertion failures.
>

I put together a patch and created a simple test to ensure the enum
constants are kept in sync:

webrev: http://cr.openjdk.java.net/~cushon/8211138/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8211138

I wonder if there are good options for preventing this mistake statically,
instead of with a test. (e.g. using EnumSets, but maybe that's a
non-starter for performance reasons?)
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