RFR: 8252600: remove mx configuration [v2]

[Doug Simon]

On Sun, 18 Apr 2021 20:17:14 GMT, Doug Simon <dnsimon 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.
>
> Doug Simon has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   8252600: [JVMCI] remove mx configuration

On second thoughts, I concur with you Alan and am thus using this PR to remove the mx configuration files.

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