[lilliput-jdk17u:lilliput] RFR: 8314894: [Lilliput/JDK17] Revert changes in zRelocate, prevent ZGC with Lilliput

[Aleksey Shipilev]

On Wed, 23 Aug 2023 14:26:58 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:
>  - [x] hotspot_gc +UCOH
>  - [x] hotspot_gc -UCOH (default)

Marked as reviewed by shade (Reviewer).

-------------

PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/56#pullrequestreview-1591773668