Optimised ARM assembler loop

[Andrew Haley]

Edward Nevill wrote:

> I have now completed converting the bytecodeInterpreterOpt.cpp in my previous email into hand crafted ARM assembler and uploaded to my PPA.

> This gives approx 100% performance improvement over the original Zero.

Excellent.  Can I make one tiny, teeny request?  The first time I
read that I assumed that 100% of the time was saved, and thus it
was infinitely fast.  :-)

OK, I knows that's not what it means.  I presume it's now twice as fast
as Zero.

Andrew.