[LWorld] Value type array support for C2 (and lots of bug fixes)

[Tobias Hartmann]

On 17.05.2018 15:35, Roland Westrelin wrote:
> Then we don't need a null check, right? It's either a ValueTypeNode or
> the null constant. Instead of the null check, I think we want an assert
> for a null constant and unconditionally an uncommon trap.

Right, what about that (incremental webrev)?
http://cr.openjdk.java.net/~thartmann/valhalla/lworld_arrays/webrev.01/

I've also fixed a too string assert that was triggered when running the compiler tests with -Xcomp.

Thanks,
Tobias