Function getOriginInDfg

Example: consider the following code:

x <- 2
if(u) {
  x <- 3
}
print(x)
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Requesting the origin of x in the print(x) node yields two SimpleOriginOrigin|variable origins for both definitions of x. Similarly, requesting the origin of print returns a BuiltInFunctionOrigin.

This returns undefined only if there is no dataflow correspondence (e.g. in case of unevaluated non-standard eval).