hpx::parallel::count/count_if failing tests

[pmikolajczyk41]

Actual Behavior

Tests fail for hpx::parallel::count and hpx::parallel:count_if for larger cases.

Steps to Reproduce the Problem

It is enough to change size from 33 to 65.

hpx/tests/regressions/parallel/count_3646.cpp

Lines 52 to 58 in b287b7f

	void test_count()
	{
	using Iter = BitCountingIterator<std::int64_t{33}>;
	using Sent = Sentinel<std::int64_t>;
	auto stdResult = std::count(Iter{0}, Iter{33},
	std::int64_t{1});

Specifications

• Ubuntu 18.04 LTS
• GCC 8.2.0
• CMake 3.13.4

Remarks

The same thing occurs also before commits to #3646, i.e. with functions accepting one type of iterators.

Similar problem was encountered in #3442. It may be the partitioner that looses control over chunks. I have made a breakpoint here:

hpx/hpx/parallel/util/loop.hpp

Lines 64 to 70 in b287b7f

	static Begin call(Begin it, End end, F && f)
	{
	for (/**/; it != end; ++it)
	f(it);
	return it;
	}

and seen that program was iterating over elements with completely strange values.

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