Curious. Found a bug in liveness where liveIn set becomes empty erroneously. While...

Curious.  Found a bug in liveness where liveIn set becomes empty erroneously.  While tracing bug back the output started producing the correct liveIn set, but the code diff confirms to me that I haven't made a functional change to the system.  I've been trying to understand what happened, but for now I'll check in this working, stable capture and keep an eye on liveness results in case the bug is just latent now.