remove use of new/delete and use halide_malloc/halide_free for hexagon_host.cpp - windows build issue
remove use of new/delete and use halide_malloc/halide_free for hexagon_host.cpp - windows build issue


Former-commit-id: 250912cc25098d91a0f3873f08418a4486584763
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide