SPECjvm2008 benchmark numbers for AArch64

[Petr Tůma]

Hi Andrew,

> I would surely hope that the exact same JVM should be used for Graal
> and C2 compiler runs, otherwise the test is completely invalid.

The JVM was not exactly the same. For the numbers I posted, HotSpot was 
1.8.0-162 for x86_64 which Oracle makes available on their web. Graal 
was running on top of HotSpot 1.8.0-151 with JVMCI 0.38 again from 
Oracle web. The OpenJDK build was completely different of course.

I would not go as far as call the test "completely invalid". It was not 
done to compare Graal against C2 with strict isolation of as many other 
factors as possible. It was simply a small subset of measurements we use 
to track changes in Graal performance, which can give some idea of what 
ranges of values to expect on the benchmarks.

Hope this explains things.

Petr