[PATCH] BigInteger - minor performance & cleanup

[Pascal S. de Kloe]

I couldn't sleep last night so I decided to read the Java source. 
Sending a patch that very evening was a *bad* idea. Sorry about that.
The arraycopy method did not improve things at all.

However, the minor changes actually do work. The attachments 
original.log and patched.log each contain 5 results of Benchmark.java.

OpenJDK Runtime Environment (build 
1.7.0-internal-pascal_03_jul_2007_21_30-b00)
Java flags: "-server -Xnoclassgc"

Happy ending after all?
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