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

[Roman Kennke]

On Wed, 21 Jun 2023 15:07:18 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> 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.

Good!
(How did the threadService.cpp change happen? WTF.)

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Marked as reviewed by rkennke (Reviewer).

PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/39#pullrequestreview-1491083226