openmp: Make finalize_task_copyfn order reproduceable [PR104517]

openmp: Make finalize_task_copyfn order reproduceable [PR104517]

The following testcase fails -fcompare-debug, because finalize_task_copyfn
was invoked from splay tree destruction, whose order can in some cases
depend on -g/-g0.  The fix is to queue the task stmts that need copyfn
in a vector and run finalize_task_copyfn on elements of that vector.

2022-02-15  Jakub Jelinek  <jakub@redhat.com>

	PR debug/104517
	* omp-low.cc (task_cpyfns): New variable.
	(delete_omp_context): Don't call finalize_task_copyfn from here.
	(create_task_copyfn): Push task_stmt into task_cpyfns.
	(execute_lower_omp): Call finalize_task_copyfn here on entries from
	task_cpyfns vector and release the vector.

	* gcc.dg/gomp/pr104517.c: New test.