Add (failing) test that halide doesn’t clobber OpenGL state.
Add (failing) test that halide doesn’t clobber OpenGL state.

Sets the state to an arbitrary known value, calls halide, then checks the state.


Former-commit-id: c8142d58b4e50a136d25b915543a99bfad95abae
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide