Revert "Introduce class "aligned_data" to provide portable way for aligend memory allocations."

This reverts commit f738683990ef30a43d74868a4e58af46f9f222bd.

Conflicts:
	test/prefix_sum/PrefixSumTest.h
Test: Include <chrono>

This fixes a compilation error introduced by revision 473 "Switch to
std::chrono.".