* src/threads/native/threads.h, src/threads/native/threads.c

* src/threads/native/threads.h, src/threads/native/threads.c
(nativethread): Removed. This struct is now inlined in threadobject.
(threads_table_entry_t): New type.
(threads_table_t): New type.
Some further cleanup.

* src/vm/builtin.h (THREADINFO): Becomes THREADOBJECT.

* src/vm/jit/intrp/intrp.h (THREADINFO): Becomes THREADOBJECT.

* src/vm/jit/stacktrace.c (_stackframeinfo): This is now directly
a field of threadobject.

* src/vm/jit/stacktrace.h (THREADINFO): Becomes THREADOBJECT.

* src/native/jni.h (THREADINFO): Becomes THREADOBJECT.

* src/native/jvmti/jvmti.c (isSleeping): Renamed to sleeping.