Fix computation of the upper bound of the span of the index of a load.
Fix computation of the upper bound of the span of the index of a load.


Former-commit-id: 5ad5ad31c85e0af833163b12e8e0ade3eadad3bb
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide