With -dataflow-log=/dir we will write /dir/0.html etc for each
These files show the function's code and CFG, and the path through
the CFG taken by the analysis. At each analysis point we can see the
Currently the lattice state dump is not terribly useful but we can
improve this: showing values associated with the current Expr,
simplifying flow condition, highlighting changes etc.
(Trying not to let this patch scope-creep too much, so I ripped out the