RFR: 8365190: Remove LockingMode related code from share

[Coleen Phillimore]

On Thu, 4 Sep 2025 10:18:27 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

>> src/hotspot/share/runtime/basicLock.hpp line 53:
>> 
>>> 51:   static int displaced_header_offset_in_bytes() { return metadata_offset_in_bytes(); }
>>> 52: 
>>> 53:   // For lightweight locking
>> 
>> If the following are for lightweight locking then what are the two previous for?
>
> For something old and soon forgotten. :)
> After I had integrated some platforms I realized that this was no longer needed, but since I want to keep this PR clean of platform changes, I have added this to the [next cleanup](https://bugs.openjdk.org/browse/JDK-8365191).

This makes sense to change the displaced header names in BasicLock with the changes to various disp_hdr and other register names in the next cleanup.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27041#discussion_r2321704905