Added forward declaration of operator<< for Halide::Module that already exists.
Added forward declaration of operator<< for Halide::Module that already exists.


Former-commit-id: 918aab3dc89af800e248ee801b9dceabac2753e7
darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide