RFR: 8329898: Revert one use of markWord.is_unlocked back to is_neutral

[David Holmes]

On Tue, 9 Apr 2024 07:20:02 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> [JDK-8325303](https://bugs.openjdk.org/browse/JDK-8325303) changed a number of occurrences of `is_neutral` to `is_unlocked`, but one change in basicLock.cpp should not have been changed as it relates to the displaced markword.
>> 
>> This is a trivial change.
>> 
>> Testing:
>>  - tiers 1-3 (sanity)
>> 
>> Thanks
>
> Marked as reviewed by stefank (Reviewer).

Thanks for the review @stefank

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

PR Comment: https://git.openjdk.org/jdk/pull/18684#issuecomment-2044345003