RFR: 8290373: Enable lossy conversion warnings on Windows [v4]

[David Holmes]

On Fri, 22 Jul 2022 14:56:08 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>  I propose that when a patch touches a file with lossy conversion warnings disabled, it should also enable the warnings and fix them for that file.

This contradicts other common recomendations of not mixing unrelated issues in the same PR. Fixing style nits is harmless but fixing an actual lossy conversion issue could itself lead to bugs and unexpected fanout.

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PR: https://git.openjdk.org/jdk/pull/9516