[8u20] Request for approval: 8026300 VM warning: increase O_BUFLEN in ostream.hpp -- output truncated occurs with fastdebug VM when printing flags

[Zhengyu Gu]

Please approve backport this simple fix on print format string. The 
backport should go to hotspot repository (jdk8u/hs-dev)

Bug: https://bugs.openjdk.java.net/browse/JDK-8026300
JDK9 changeset: 
http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/b7cd330fd5b6
Webrev: http://cr.openjdk.java.net/~zgu/8026300/webrev.00/

Review:
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2013-December/010259.html
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2013-December/010393.html



Thanks,

-Zhengyu