[2.3 BACKPORT] 7197906: BlockOffsetArray::power_to_cards_back() needs to handle > 32 bit shifts

[Andrew Hughes]

The fix for 7197906 is in IcedTea7 HotSpot HEAD but not in our last release
branch, 2.3.  It applies pretty cleanly to 2.3 and builds.  I'd like to include
it in 2.3 so it goes out with the security update next month, rather than
waiting for 7u12 at the end of April
(http://openjdk.java.net/projects/jdk7u/releases/7u12.html)

Is this ok for backport?

It's also probable it will be backported to 2.1 & IcedTea6 as well, if it
applies cleanly, so we're fully covered.  I'll post separately for these.

Thanks,
-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

PGP Key: 248BDC07 (https://keys.indymedia.org/)
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