Construct PDG exclusively on provenance information #1107
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Record field and index projections for pointers by recording a Project event with a base and target pointer pair.
Add an index value to Project events to differentiate between different projections with the same pointer offset, e.g., (*p).x and (*p).x.a if a is the first field of the structure. This is implemented as an IndexSet<Vec<usize>> where each element is a unique combination of field projections. The Project index points to an element in this set.
The event assignment-based PDG construction steps were giving incorrect results for indirect accesses, so remove them completely.
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This is a split of the first few commits of #1086 so it can be reviewed and landed faster.