Powershell: Fix dataflow/SSA consistency errors. #110
Merged
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This adds the dataflow consistency queries for Powershell, and also fixes the worst offenders. In particular, every dataflow node must have an enclosing callable, and I had forgotten to implement this predicate 😅
In addition, Poweshell, unfortunately, needs dataflow nodes for certain statements (because of the structure of the AST), and I had forgotten to include these in SSA.
Both of these problems are fixed in this PR. There are no changes to results because we're still missing loads of control flow.