Changed return type of Image::operator() const to const T&.
Changed return type of Image::operator() const to const T&.


Former-commit-id: 9927db1be431ff2fa1c431252149f8727ab41afd
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide