RFR: 8253089: Windows (MSVC 2017) build fails after JDK-8243208

[Martin Doerr]

On Mon, 14 Sep 2020 12:58:35 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> It seems that MSVC 2017 is getting confused about the differences in `unsigned int` and `u2`. After a few attempts at
> fixing this, I think we need to use `u2` consistently for hash code computations.

Marked as reviewed by mdoerr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/150