[lworld] RFR: 8236522: non-tearable inline classes

[John R Rose]

On Sat, 28 Mar 2020 21:46:15 GMT, John R Rose <jrose at openjdk.org> wrote:

> Reviewed on valhalla-dev as https://mail.openjdk.java.net/pipermail/valhalla-dev/2020-March/006879.html
> 
> (Note:  The design is also under discussion by valhalla-spec-experts.)

Targeted regression testing in `test/hotspot/jtreg/runtime/valhalla/valuetypes` shows only pre-existing failures.

Adding `+UnlockDiagnosticVMOptions` to JTREG tests, since new option `ForceNonTearable` is diagnostic.

Pre-existing bug reported as https://bugs.openjdk.java.net/browse/JDK-8241894

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PR: https://git.openjdk.java.net/valhalla/pull/7