IRVisitor wasn't visiting the message in an assert
IRVisitor wasn't visiting the message in an assert


Former-commit-id: f3ff63cae5e358931d5ccb360664e9f175ae71d6
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide