RFR: 8065988: Duplicated error messages for "no source file" in javac

[bitter_fox]

Hi,
Please review my patch for 8065988.

I couldn't write the test.
Could you write the test for this issue?

webrev is here:
http://cr.openjdk.java.net/~shinyafox/8065988/webrev.00/

bugs is here:
https://bugs.openjdk.java.net/browse/JDK-8065988

Regards,
Shinya Yoshida(@bitter_fox, shinyafox)
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