RFR: Backout of backport

[Iris Clark]

On Tue, 1 Feb 2022 12:56:14 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> This discussion was raised in the review of #66: How should we handle the backout of a backport where the main issue is not backed out? The proposed process has been discussed in a few different forums and even though it has a few drawbacks it seems to be the solution that is most in line with our other processes and invariants.

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/guide/pull/74