Fix bug in stack implementation that was reordering things.
Fix bug in stack implementation that was reordering things.


Former-commit-id: 3ceaeb699103ab3d1445e19498d1a30c558a0f8b
Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide