RFR: JDK-8213745: Don't use memset to initialize array of RegMask in matcher.cpp

[Roman Kennke]

Yes, I did use the same type that was used for the same thing a few
lines up.

Thanks for reviewing!
Anybody else? Or ok to push as trivial?

Roman

> Looks good to me. I'd say "use size_t for accessing array elements", but it seems the same file uses
> uint consistently, so there is no need to deviate.

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