Backports to jdk11u and jdk17u

[Aleksey Shipilev]

On 2/1/23 03:23, yangfei at iscas.ac.cn wrote:
>    Good news is that following three repos have been created by ops and should be ready for use!
> 
>      https://github.com/openjdk/riscv-port-jdk17u
>      https://github.com/openjdk/riscv-port-jdk11u
>      https://github.com/openjdk/riscv-port-jdk8u
> 
>    They are seeded with jdk{17, 11, 8}u-dev repos respectively.
>    We should start from riscv-port-jdk17u. And I have created a riscv-port branch in this repo for future 17u backporting work.
>    As mentioned by Lindenmaier Goetz, the initial backport should be restricted to the changes that are definitely needed to get it working.
>    Also, changes to shared code should be kept to a minimum.
>    Please let me know if there are other things missed.

I have added the webrev autogeneration from these repos to my CI:
   https://builds.shipilev.net/patch-openjdk-riscv-jdk8/
   https://builds.shipilev.net/patch-openjdk-riscv-jdk11/
   https://builds.shipilev.net/patch-openjdk-riscv-jdk17/

These diff "riscv-port" branch against relevant master fork. Only 17u currently has such a branch, 
and it is currently empty. This is why only that webrev is generated. Once we put more stuff into 
that branch, I would also provide the nightly builds for it. This would test if the backport breaks 
anything else.

-- 
Thanks,
-Aleksey