Truffle on stock OpenJDK >= 11

[Jaroslav Tulach]

Hello Raffaello,
recently I needed a "getting started" project for educational purposes. I've 
created:

https://github.com/jaroslavtulach/talk2compiler

The `Main.java` class is all that is needed to switch into Truffle compilation 
mode and use all the Truffle APIs to "talk to the compiler".

-jt

> Given that Graal is part of recent stock OpenJDKs, is it possible to use
> Truffle on them? This is not stated explicitly on the Truffle GitHub
> repo [1], which mentions prebuilts in GraalVM but does not mention OpenJDK.
> 
> More generally, which components of GraalVM listed in [2] can be built
> and used on OpenJDK 11 or newer?
> 
> 
> Greetings
> Raffaello
> 
> ----
> 
> [1] https://github.com/oracle/graal/tree/master/truffle
> [2] https://github.com/oracle/graal