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

[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

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Commit messages:
 - [Lilliput] Enable fast-locking for Lilliput

Changes: https://git.openjdk.org/lilliput/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput&pr=64&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300733
  Stats: 7 lines in 4 files changed: 3 ins; 0 del; 4 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