RFR: JDK-8253239: Disable VS warning C4307 [v2]

[Erik Joelsson]

On Fri, 18 Sep 2020 10:00:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Matthias Baesken 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:
>>   JDK-8253239
>
> This looks fine to me, but build maintainers should approve.

I left a suggestion for a comment. You should be able to just accept it if you are happy with it. If you would rather
write something yourself, I recommend committing without --amend. The Skara bot will automatically squash all your
changes before merging this to the main repo.

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PR: https://git.openjdk.java.net/jdk/pull/237