RFR: 8252600: [JVMCI] remove mx configuration

[Doug Simon]

On Sun, 18 Apr 2021 07:32:07 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> This PR removes the mx configuration files in the JDK as they do not really belong here. Instead, I've updated and moved them to https://github.com/dougxc/mx_jdk.
>
> Are you sure it make sense to have this dev config in the openjdk/jdk repo? I would think this is something for the downstream Graal repos.

Thanks @AlanBateman , @erikj79 and @vnkozlov for the reviews.

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PR: https://git.openjdk.java.net/jdk/pull/3559