hg: jdk/sandbox: 8213745: Don't use memset to initialize array of RegMask in matcher.cpp

[chris.hegarty at oracle.com]

Changeset: 710e5a66a64e
Author:    rkennke
Date:      2018-11-12 22:00 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/710e5a66a64e

8213745: Don't use memset to initialize array of RegMask in matcher.cpp
Reviewed-by: kvn, shade

! src/hotspot/share/opto/matcher.cpp