RFR: JDK-8230744 Several classes throw OutOfMemoryError without message

[Jim Laskey]

Cleans up every case of OutOfMemoryError without a message. Some logic changes in String::repeat and ByteArrayChannel:: hugeCapacity.

Thank you.

Cheers,

-- Jim

webrev: http://cr.openjdk.java.net/~jlaskey/8230744/webrev-00/index.html <http://cr.openjdk.java.net/~jlaskey/8230744/webrev-00/index.html>
jbs: https://bugs.openjdk.java.net/browse/JDK-8230744 <https://bugs.openjdk.java.net/browse/JDK-8230744>