Current and near future state of the Valhalla git repository

[Frederic Parain]

You might have noticed that the HEAD of the lworld branch in the 
Valhalla git repository on GitHub is currently broken.
We are in the process of transitioning from the previous value classes 
model to the new model described in JEP 401 
(https://openjdk.org/jeps/401). This transition requires significant 
changes in both the JVM and some core-libraries classes: removal of 
bytecodes, new class file format, etc. Unfortunately, all those changes 
are too big to be done in a single changeset. So, changes will be 
integrated incrementally, and in the mean time, things might  be broken.

We have considered doing the changes in a separate branch, but trying to 
maintain two branches in relative sync with JDK mainline would have 
doubled the merge workload. And anyway, the old value class model in the 
lworld branch will not be maintained anymore, so it doesn't make sense 
to continue keeping it working.

If you still need a buildable and functioning version of the Valhalla 
prototype, even if it implements the old value class model, the last 
good state of the lworld branch is commit 
1d120f32389332fdcfcd3213300a73447ad26e4d

If you are working on your own branch created from the lworld branch, we 
recommend to wait until the end of the transition before pulling changes 
from lworld to your branch.

Fred