[lilliput-jdk17u:lilliput] RFR: 8310555: [Lilliput/JDK17] Revert innocuous changes against upstream

[Aleksey Shipilev]

The code trawl identified a few places where we diverge from upstream without reason. 

The only non-obvious change is reverting `set_deadlock(true)` thing. The results that method is setting is actually unused, see https://bugs.openjdk.org/browse/JDK-8268857.

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Commit messages:
 - Work

Changes: https://git.openjdk.org/lilliput-jdk17u/pull/39/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=39&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310555
  Stats: 7 lines in 3 files changed: 3 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/39.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/39/head:pull/39

PR: https://git.openjdk.org/lilliput-jdk17u/pull/39