Issues building graal-jvmci-8 with Cygwin

[Jorn Vernee]

Hi Doug,

> The unfortunately thing is that mx used to be a first class citizen on
> mx but since we no longer have anyone internally developing on
> Windows, it has bit rotted.

Sorry for sounding frustrated. I have been interested in Graal for a few 
years, but have been getting turned away by build issues.

Should I report the errors I'm seeing with mx on github?

> You can use the version of IGV included in the GraalVM EE downloads
> available at
> https://www.oracle.com/technetwork/oracle-labs/program-languages/downloads/index.html.
> It's in bin/idealgraphvisualizer.

I've downloaded the Windows GraalVM EE snapshot, but it does not include 
idealgraphvisualizer.

I've tried running the one from the Linux version with cygwin, but that 
doesn't seem to work either. (throws some error about not being able to 
read a .clusters file)

Thanks,
Jorn