moved invalidate_cache to func::hexagon
moved invalidate_cache to func::hexagon


Former-commit-id: 7455dc732104cb5cfe330db8d6a9e8921d4f2d61
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide