RFR (S) 8145428: Optimize StringUTF16 compress/copy methods for C1

[Aleksey Shipilev]

On 12/17/2015 02:34 AM, Ulf wrote:
> I'm wondering why moving the increment operation to an extra line wound
> enhance performance.

Because C1 is very straightforward, and code movement like that is a
poor man's instruction scheduling, that pads out the data dependency
between index update and indexed access. I don't think it deserves a
comment -- it is expected one will run the benchmarks when changing that
code.

Thanks,
-Aleksey