Fix constructing Halide::Buffer from buffer_t
Fix constructing Halide::Buffer from buffer_t

Wasn't copying the shape over correctly.


Former-commit-id: 284748b67ca15e74eeaed459d339978663f9e2f6
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide