[lilliput-jdk17u:lilliput] RFR: 8310042: [Lilliput/JDK17] ZGC fixes and cleanups

[Aleksey Shipilev]

On Wed, 14 Jun 2023 15:42:04 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> In ZGC, we don't need to change zLiveMap.inline.hpp and can revert to upstream state. In zBarrierSetC2.cpp we need to relax an assert.
> 
> Testing:
> - [x] hotspot_gc
> - [x] tier -XX:+UseZGC

Excellent, looks good!

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/31#pullrequestreview-1479823982