RFR: 8365190: Remove LockingMode related code from share

[Fredrik Bredberg]

On Tue, 2 Sep 2025 20:11:15 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Since the integration of [JDK-8359437](https://bugs.openjdk.org/browse/JDK-8359437) the `LockingMode` flag can no longer be set by the user. After that, a number of PRs has been integrated which has removed all `LockingMode` related code from all platforms (except from zero, which is done in this PR).
>> 
>> This PR removes `LockingMode` related code from the shared (non-platform specific) files. It also removes the `LockingMode` variable itself.
>> 
>> Passes tier1-tier5 with no added problems.
>
> src/hotspot/share/jvmci/vmStructs_jvmci.cpp line 344:
> 
>> 342:   volatile_nonstatic_field(ObjectMonitor,      _entry_list,                                   ObjectWaiter*)                         \
>> 343:   volatile_nonstatic_field(ObjectMonitor,      _succ,                                         int64_t)                               \
>> 344:   volatile_nonstatic_field(ObjectMonitor,      _stack_locker,                                 BasicLock*)                            \
> 
> There are some jvmci tests that check that the java side of jvmci matches, ie:
> 
> make test TEST=compiler/jvmci

Tried that and got:
`TEST SUCCESS`

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PR Review Comment: https://git.openjdk.org/jdk/pull/27041#discussion_r2321428734