RFR: 8057586: Explicit GC ignored if GCLocker is active [v4]

[Thomas Schatzl]

On Tue, 28 Mar 2023 18:26:06 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> I don't get why having an alloc thread would improve/degrade the robustness of this test -- jni-call-thread and systemgc-thread should be enough.
>
> The allocations trigger GCLocker Initiated GCs, so I prefer to keep them.

Please add a comment that this is intentional to increase the variety of the GC types that can happen here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13191#discussion_r1168557820