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[EDIFNetlist] exportEDIF() to use getLibrariesInExportOrder() #1148

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EDIFNetlist.getLibrariesInExportOrder() is called by BinaryEDIFWriter.writeBinaryEDIF() already.

Without this, after generating an array of particular instances the output DCP contains an incorrectly ordered EDIF that does not get accepted by Vivado.

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@clavin-xlnx has expressed a concern over the performance impact of adding this call (which iteratively analyzes every cell in the design) to the critical-path of exporting EDIFs. Let's collect some data.

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