RFR: 8220377: Unused field SourceFileObject.flatname

[Liam Miller-Cushon]

Hi,

Please review this cleanup to remove an unused field
in SourceFileObject.flatname.

bug: https://bugs.openjdk.java.net/browse/JDK-8220377
webrev: http://cr.openjdk.java.net/~cushon/8220377/webrev.00/
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