[master] RFR: 8314863: [Lilliput] Revert changes in zRelocate, prevent ZGC with Lilliput [v3]

[Aleksey Shipilev]

On Wed, 23 Aug 2023 10:03:49 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> The additions of SuspendibleThreadSet in [zRelocate.cpp](https://builds.shipilev.net/patch-openjdk-lilliput/src/hotspot/share/gc/z/zRelocate.cpp.udiff.html) can cause deadlocks. This problem can not easily be solved without major work in Lilliput. Let's revert those changes and prevent usage of ZGC together with Lilliput.
>> 
>> Testing:
>>  - [ ] hotspot_gc +UCOH
>>  - [ ] hotspot_gc -UCOH (default)
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Never exit hard, only change to -UCOH with warning

Marked as reviewed by shade (Committer).

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PR Review: https://git.openjdk.org/lilliput/pull/107#pullrequestreview-1591234544