Fixed a memory bug in specialize_branched_loops.
Fixed a memory bug in specialize_branched_loops.


Former-commit-id: b0b8c85b202456e7196bd816fe8dc03d18207088
darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide