Lost perf between 8u40 and 9 hs-comp

[Charles Oliver Nutter]

I'm finally at home with a working machine so I can follow up on some
VM Summit to-dos.

Vladimir wanted me to test out jdk9 hs-comp, which has all his latest
work on method handles. I wish I could report that performance looks
great, but it doesn't.

Here's timing (in s) of our red/black benchmark on JRuby 1.7.19, first
on the latest (as of today) 8u40 snapshot build and then on a
minutes-old jdk9 hs-comp build:

~/projects/jruby $ (pickjdk 4 ; rvm jruby-1.7.19 do ruby
-Xcompile.invokedynamic=true ../rubybench/time/bench_red_black.rb 10)
New JDK: jdk1.8.0_40.jdk
5.206
2.497
0.69
0.703
0.72
0.645
0.698
0.673
0.685
0.67

~/projects/jruby $ (pickjdk 5 ; rvm jruby-1.7.19 do ruby
-Xcompile.invokedynamic=true ../rubybench/time/bench_red_black.rb 10)
New JDK: jdk1.9_hs-comp
5.048
3.773
1.836
1.474
1.366
1.394
1.249
1.399
1.352
1.346

Perf is just about 2x slower on jdk9 hs-comp.

I tried out a few other benchmarks, which don't seem to have as much variation:

* recursive fib(35): equal perf
* mandelbrot: jdk8u40 5% faster
* protobuf: jdk9 5% faster

The benchmarks are in jruby/rubybench on Github. JRuby 1.7.19 can be
grabbed from jruby.org or built from jruby/jruby (see BUILDING.md).

Looking forward to helping improve this :-)

- Charlie