[master] RFR: 8307392: [Lilliput] Revert deflation of dead object's monitors

[Aleksey Shipilev]

On Wed, 3 May 2023 19:33:35 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> In https://github.com/openjdk/lilliput/pull/28, I introduced some code that forces deflation of monitors on objects that are about to die. Discussions around a possible upstreaming of this code (https://github.com/openjdk/jdk/pull/13721) comes to the conclusion that this should not be necessary, and indeed, I could not reproduce the original problem that I was having in Lilliput with the code removed. I assume some changes in upstream and/or Lilliput since then have fixed the root cause. Let's remove that code and see what explodes.
> 
> Testing: (All with -XX:+UseHeavyMonitors to amplify monitor traffic)
>  - [x] hotspot_gc
>  - [x] tier1
>  - [x] tier2
>  - [x] SPECjvm workloads

But we know this would not be safe without the GC threads rendezvous-ing, right? Also, this seems to include #90.

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PR Review: https://git.openjdk.org/lilliput/pull/88#pullrequestreview-1412565627