rework load_library test to use OpenCL, not Hexagon
rework load_library test to use OpenCL, not Hexagon


Former-commit-id: 5b823a7ea816afff533c8a752ea83731fe8cc8d4
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide