Description
HybridCall is performing assigning to NativeCFGs parameters as we would do for calls to regular CFGs,
but:

• the assignment is not needed: the rewritten expression will not access the values by trying to access the names of the instrumented cfg, but just by their position in the array of ExpressionSets
• the assignment is not cleaned later: while will regular calls we push and pop scopes to remove variables when we switch contexts, we'd need to forget these parameters being assigned with manual calls to forgetIdentifiers, adding unneeded complexity to the analysis
  At this point it's just better to remove the assignments entirely.