[master] RFR: 8300733: [Lilliput] Enable fast-locking for Lilliput [v3]

[Roman Kennke]

> Fast-locking provides many advantages for Lilliput. Most importantly, it greatly simplifies the access of the mark word: we no longer need to handle the case of stack-locking which has been racy and complicated.
> 
> This change enables fast-locking, but doesn't yet touch any of the improvements that it provides (simpler loading of Klass*, etc).
> 
> Testing:
>  - [x] tier1
>  - [x] tier2

Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:

  Fix/revert Shenandoah forwarding protocol to not use INFLATING 2-step

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

Changes:
  - all: https://git.openjdk.org/lilliput/pull/64/files
  - new: https://git.openjdk.org/lilliput/pull/64/files/4ced8f55..45e13179

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=64&range=02
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=64&range=01-02

  Stats: 20 lines in 1 file changed: 0 ins; 13 del; 7 mod
  Patch: https://git.openjdk.org/lilliput/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/lilliput pull/64/head:pull/64

PR: https://git.openjdk.org/lilliput/pull/64