Marlin renderer patches for jdk8u integration

[Laurent Bourgès]

Dear all,

Here are the exact 21 patches backporting the Marlin renderer 0.9.1.3 to
jdk8u-dev:
- 19 patches (from zulu8) m01 to m19 from:
https://github.com/bourgesl/marlin-jdk8u/tree/master/marlin-zulu

See my patch script:
https://github.com/bourgesl/marlin-jdk8u/blob/master/marlin-zulu/doPatch.sh

- 2 new patches 8-m20 and 8-m21 from:
https://github.com/bourgesl/marlin-jdk8u/tree/master/marlin-jdk/jdk8-patches

See the 2nd patch script:
https://github.com/bourgesl/marlin-jdk8u/blob/master/marlin-jdk/doPatch.sh

I applied cleanly patches on jdk8u-dev, made a clean build and performance
is good: marlin renderer is enabled by default, instead of the Pisces
renderer: up to 4x times faster in my benchmarks.

See my simple build scripts:
https://github.com/bourgesl/marlin-jdk8u/blob/master/doGetOpenJDK8.sh
https://github.com/bourgesl/marlin-jdk8u/blob/master/doBuild.sh
Such linux x64 build is available (pure openjdk8u-dev oct 16th + patches)
for testing purposes:
https://github.com/bourgesl/marlin-jdk8u/releases/tag/v0.1

FYI I prepared this backport and my review based on the following bug list:
https://github.com/bourgesl/marlin-jdk8u/blob/master/README.md


Finally I am ready to work with any jdk8u reviewer on the formal review
process (jdk8u label, individual patch RFR...).
Let me know how to proceed. Who could help me on the reviews and run
validation tests...

Question: do you agree to enable the Marlin renderer by default in OpenJDK8
? or prefer staying with the former Pisces renderer ? It consists in a few
line change in the RenderingEngine class.

PS: I can copy all this material on cr.openjdk.java.net if necessary. Just
tell me.

Cheers,
Laurent