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

[Roman Kennke]

While working on something in src/hotspot/share/opto/matcher.cpp I
noticed the compiler (gcc 8.2.1) complaining/warning about using memset
to initialize a RegMask[]. We should use the RegMask initializer instead.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8213745
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8213745/webrev.00/

Testing: passes tier1

Ok?

Roman

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