RFR: Export JavaThread::_lock_id, ObjectMonitor::_stack_locker and markWord::marked_value.

[Yudi Zheng]

On Mon, 22 Jul 2024 16:00:00 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

> Essential exports for implementing fibers support in Graal.

src/hotspot/share/jvmci/vmStructs_jvmci.cpp line 224:

> 222:   nonstatic_field(JavaThread,                  _scopedValueCache,                             OopHandle)                             \
> 223:   nonstatic_field(JavaThread,                  _anchor,                                       JavaFrameAnchor)                       \
> 224:   nonstatic_field(JavaThread,                  _lock_id,                                      int64_t)                               \

These exported fields are used in the inlined monitorenter/exit JIT code, e.g., 
https://github.com/oracle/graal/pull/9366/files#diff-25609d0f9d08c0d8a8e13f1f0b11c996f9fbe3f632a4a099bd1ee634a6748eb3R578-R579
ported from
https://github.com/openjdk/loom/pull/210/files#diff-318d0e76b9a97e8cf8936be1de34e52735c4d947a77cac38babbbf9a081d16fcR540-R542

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PR Review Comment: https://git.openjdk.org/loom/pull/211#discussion_r1700373159