RFR: 8365190: Remove LockingMode related code from share

[Coleen Phillimore]

On Thu, 4 Sep 2025 09:55:23 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

>> src/hotspot/share/runtime/synchronizer.inline.hpp line 48:
>> 
>>> 46:   assert(current == Thread::current(), "must be");
>>> 47: 
>>> 48:     LightweightSynchronizer::enter(obj, lock, current);
>> 
>> In the further RFE, we should remove these dispatch functions too.
>
> Added this to o the [next cleanup](https://bugs.openjdk.org/browse/JDK-8365191).

So to be clear, we should probably have 2+ RFEs that follow this.  One to remove the cpu specific names like displaced header, one to remove the loom interactions and held_monitor_count, and another to remove the dispatches to LightweightSynchronizer and make ObjectSynchronizer's role in object locking clear.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27041#discussion_r2321723438