[llvm-dev] kaleidoscope ch4 jit example regression?

[Nick Desaulniers via llvm-dev]

https://llvm.org/docs/tutorial/LangImpl04.html has an example where
the function `foo` gets redefined, and the JIT returns evaluation of
the latest definition.  I thought my code was wrong, but it seems that
the binary produced by `ninja Kaleidoscope-Ch4` has the same bug.

Granted, my LLVM checkout is from Nov 3 2018 (r346062).  Is this a known issue?
~Nick Desaulniers