RFR: 8253064: monitor list simplifications and getting rid of TSM

[Daniel D.Daugherty]

On Tue, 13 Oct 2020 20:31:44 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> Changes from @fisk and @dcubed-ojdk to:
> 
> - simplify ObjectMonitor list management
> - get rid of Type-Stable Memory (TSM)
> 
> This change has been tested with Mach5 Tier[1-3],4,5,6,7,8; no new regressions.
> Aurora Perf runs have also been done (DaCapo-h2, Quick Startup/Footprint,
> SPECjbb2015-Tuned-G1, SPECjbb2015-Tuned-ParGC, Volano)
>   - a few minor regressions (<= -0.24%)
>   - Volano is 6.8% better
> 
> Eric C. has also running promotion perf runs on these bits and says "the results look fine".

Self review done.

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PR: https://git.openjdk.java.net/jdk/pull/642