iOS OpenJDK-11 Hotspot Arm64 & Intro

[Sven Gothel]

I have worked myself through the OpenJDK9 to
OpenJDK9-mobile differences and also compared both with
the OpenJDK11 source tree.

Hence I answer myself for now ..

On 7/9/19 6:15 AM, Sven Gothel wrote:
> 
> I have observed Johan's work over the last months, i.e. working
> on the openjdk-9-mobile port to openjdk-11.
> Johan, I would love to learn about the status/result of your work
> here - i.e. is it now possible to produce an iOS Hotspot-Arm64 build?
> What's left to do to produce a
>    "iOS OpenJDK-11+ Hotspot Arm64 Build"?

To have a working Hotspot-Arm64 or better Hotspot-Aarch64
build, I have added the os_cpu/bsd_aarch64 code path also
to be used for iOS.

When I successfully have brought up this build on iOS,
I will publish these changes of course, using git.

The next step might be the migration to OpenJDK11
and maybe testing the AOT OpenJDK work later on (depending on GraalVM).

~Sven