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There's now a `localFlowStep` predicate for use directly in queries and other libraries and a `simpleLocalFlowStep` for use only by the global data flow library. The former predicate is intended to include field flow, but the latter may not. This will let Java and C# (and possibly C++ IR) avoid getting two kinds of field flow at the same time, both from SSA and from the global data flow library. It should let C++ AST add some form of field flow to `localFlowStep` without making it an input to the global data flow library.