RFR 8177486: incorrect handling of mandated parameter names in MethodParameters attributes

[Liam Miller-Cushon]

Hello,

Please review this fix for JDK-8177486, which is a class reading bug that
affects MethodParameters attributes with mandated parameters.

Bug: https://bugs.openjdk.java.net/browse/JDK-8177486
Webrev: http://cr.openjdk.java.net/~cushon/8177486/webrev.00/
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