RFR: 8257848: -XX:CompileCommand=blackhole, * should be diagnostic [v4]

[Vladimir Kozlov]

On Tue, 8 Dec 2020 06:44:09 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > Do you need to update blackhole tests to add -XX:+UnlockDiagnosticVMOptions?
> 
> They already have it, because they use `-XX:+AbortVMOnCompilationFailure`.

Good.

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PR: https://git.openjdk.java.net/jdk/pull/1674