change const_int_bounds to allow int less than 32 as long it doesn't overflow
change const_int_bounds to allow int less than 32 as long it doesn't overflow


Former-commit-id: 3e3b565641f82267001c7347d5584e7b11dd8c7e
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide