RFR: 8257502: Builds fail with new warnings after JDK-8256254 [v2]

[Aleksey Shipilev]

On Tue, 1 Dec 2020 13:10:00 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Trivial, right? So I can push as soon as tests go green?
>
>> Trivial, right? So I can push as soon as tests go green?
> 
> Please do.

`x86_32` build-test and `s390x` build passed in GH Actions. I would not wait for Windows tests to catch up.

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PR: https://git.openjdk.java.net/jdk/pull/1536