Backports to jdk11u and jdk17u

[Ludovic Henry]

Hello,

As we are seeing more and more adoption of RISC-V, there is a growing need
for users to have access to more versions of Java available on RISC-V. Many
organizations are still using Java 11 and Java 17 in production and it
would be great to have RISC-V support available for them too. This would
allow them to take advantage of the benefits that RISC-V offers by making
their codebase more portable.

Taking a similar approach to AArch64 backports to JDK8u [1], we would want
to create the openjdk/riscv-port-jdk11u and openjdk/riscv-port-jdk17u
repositories on GitHub. Additionally, we can work with the maintainers of
the JDK 11u [2] and JDK 17u [3] projects to ensure there is a possible path
to getting it merged.

Some questions which I'm not sure about yet:
- Is there a need to backport to JDK 8u?
- What is the engineering cost of the divergence between JDK8u and JDK head
for the backporting effort?

Looking forward to your feedback,

Thank you,
Ludovic

[1] https://hg.openjdk.java.net/aarch64-port/jdk8u
[2]
https://wiki.openjdk.org/display/JDKUpdates/JDK11u#JDK11u-maintainersMaintainers
[3] https://wiki.openjdk.org/display/JDKUpdates/JDK+17u#JDK17u-maintainers
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