RFR: 8230743 - StringJoiner does not handle too large strings correctly

[Jim Laskey]

Change NegativeArraySizeException to OutOfMemoryError. Tests added.

Cheers,

-- Jim

webrev: http://cr.openjdk.java.net/~jlaskey/8230743/webrev-00/index.html 
<http://cr.openjdk.java.net/~jlaskey/8230743/webrev-00/index.html>
jbs: https://bugs.openjdk.java.net/browse/JDK-8230743 
<https://bugs.openjdk.java.net/browse/JDK-8230743>