[7u] Request for approval: 8017067: [pack200] improve performance of pack200

[Alexander Zuev]

Hello,

   please approve the direct back port of the fix for 8017067: [pack200] 
improve performance of pack200
into the jdk7u-dev/jdk repository.

Bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8013155

Webrev:
http://cr.openjdk.java.net/~kizune/8013155/webrev.02/

Discussion:
http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-April/016519.html