Fix boundary conditions applied to ImageParam and Image<T> to use implicit variable names (_0, _1, _2, etc...)
Fix boundary conditions applied to ImageParam and Image<T> to use
implicit variable names (_0, _1, _2, etc...)


Former-commit-id: 40c08e54b244f149d6f134a1f6fc3d8dda71c2cb
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide