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Test manual self-suspend in gctest

* tests/gctest.c [THREADS && GC_ENABLE_SUSPEND_THREAD]: Include
javaxfc.h before tiny_reverse_test() definition.
* tests/gctest.c [THREADS] (tiny_reverse_test): Rename arg argument to
p_resumed and remove GC_ATTR_UNUSED.
* tests/gctest.c [THREADS && GC_ENABLE_SUSPEND_THREAD
&& !GC_OSF1_THREADS && SIGNAL_BASED_STOP_WORLD] (tiny_reverse_test):
If p_resumed is non-null then call GC_suspend_thread(pthread_self())
and set *p_resumed to true atomically.
* tests/gctest.c [THREADS && GC_PTHREADS && GC_ENABLE_SUSPEND_THREAD]
(fork_a_thread): Declare and use forked_cnt static variable; declare
and use p_resumed local variable; pass p_resumed to pthread_create().
* tests/gctest.c [THREADS && GC_PTHREADS && GC_ENABLE_SUSPEND_THREAD
&& !GC_OSF1_THREADS && SIGNAL_BASED_STOP_WORLD] (fork_a_thread): Do not
fail if first GC_is_thread_suspended(t) returns true but p_resumed is
non-null; update comment; repeat first GC_resume_thread() while
p_resumed is non-null and *p_resumed is false; call GC_suspend_thread()
and GC_resume_thread() once more but with a preceding call of
GC_collect_a_little().

25 of 25 new or added lines in 1 file covered. (100.0%)

7283 of 9913 relevant lines covered (73.47%)

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