RFR 8221118: Avoid eagerly creating JCDiagnostic for CompletionFailures

[Ron Shapiro]

Hi,

This is a small change that avoids eagerly creating JCDiagnostic for
CompletionFailures.

webrev: http://cr.openjdk.java.net/~ronsh/8221118/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8221118

Thanks,
Ron
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