Fixed bug in Block visitor that caused equal IR to return non-equal.
Fixed bug in Block visitor that caused equal IR to return non-equal.


Former-commit-id: 6de35b049c983525e7cd57f2a5233e06a13935c7
darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide