Example use of sign_extend64()

From: Martin Kepplinger
Date: Thu Feb 12 2015 - 06:12:37 EST

>From a first look, there are quite some places in arch where sign extension
is done. I append one example for review although I didn't even build this.
Don't use it unreviewed!

I guess the doc-addition to sign_extend32() would be valuable for it to be
used more often in long term.
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