Architecture optimized unit tests fail on SKX

[bremerm31]

I'm trying to generate performance measurements on the Stampede2 skylake partition. The build process is standard, except that I am adding the -march=native flag to allow the linear algebra packages to access AVX-512 ISAs.

The following unit tests fail:

Building with Eigen

The following tests FAILED:
	  9 - Unit_element_triangle (Failed)
	 10 - Unit_boundary_interface (Failed)
	 11 - Unit_edges (Failed)
	 21 - Unit_element_serialization (Failed)

Building with Blaze

The following tests FAILED:
	  8 - Unit_shape_straight_triangle (SEGFAULT)
	  9 - Unit_element_triangle (SEGFAULT)
	 10 - Unit_boundary_interface (SEGFAULT)
	 11 - Unit_edges (SEGFAULT)
	 14 - Unit_wetting_drying (SEGFAULT)
	 21 - Unit_element_serialization (Failed)

N.B. When running the tests without -march=native they all pass