Fixed excessive string manipulation during bounds inference.
Fixed excessive string manipulation during bounds inference.


Former-commit-id: f0d8b204313e4a0173e68ea4c85fc36e6d6ccc7c
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide