a55b43b67e
This commit does a lot of stuff all at once, so here are the main highlights: In `TypeTracker.qll`, we change `StepSummary::step` to step only between source nodes. Because reads and writes of global variables happen in two different (jump) steps, this requires the intermediate `ModuleVariableNode` to _also_ be a `LocalSourceNode`, and we therefore modify the charpred for that class accordingly. (This also means changing a few of the tests to account for these new source nodes.) In addition, we change `TypeTracker::step` to likewise step between local source nodes. Next, to enable the use of the `track` convenience method on nodes, we add some pragmas to `TypeTracker::step` that prevent bad joins from occurring. With this, we can eliminate all of the manual type tracker join predicates. Next, we observe that because `StepSummary::step` now uses `flowsTo`, it automatically encapsulates all local-flow steps. In particular this means we do not have to use `typePreservingStep` in `smallstep`, but can use `jumpStep` directly. A similar observation applies to `TypeTracker::smallstep`. Having done this, we no longer need `typePreservingStep`, so we get rid of it.
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