RFR: JDK-8179002: jdk/jshell/MergedTabShiftTabExpressionTest.java fails intermittently

[Jan Lahoda]

Hello,

(Another) attempt to fix MergedTabShiftTabExpressionTest. The idea is 
that currently, the output buffer is filled char-by-char, and possibly 
after each char the output verification is triggered, which in total can 
take a longish time for big outputs. So trying to override the

public void write(byte[] b, int off, int len)

method, which should ensure the output buffer is filled in bigger 
chunks, so there should be less unnecessary matching attempts and so 
less overhead.

Webrev:
http://cr.openjdk.java.net/~jlahoda/8179002/webrev.00/

Thanks,
     Jan