Added hexagon schedule to boundary_conditions test.
Added hexagon schedule to boundary_conditions test.


Former-commit-id: 61a5521e901a2d632086f3820c27457026744d02
Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide