RFR: 8214071: Broken msg.bug diagnostics when using the compiler API

[Liam Miller-Cushon]

Hi,

Please review this trivial fix for msg.bug diagnostics reported by the
compiler API.

webrev: http://cr.openjdk.java.net/~cushon/8214071/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8214071
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