hg: jdk/sandbox: 8219951: Build failure on Mac and Windows after JDK-8219922

[chris.hegarty at oracle.com]

Changeset: b378fc877045
Author:    kvn
Date:      2019-02-28 17:16 -0800
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/b378fc877045

8219951: Build failure on Mac and Windows after JDK-8219922
Summary: Add missing parentheses.
Reviewed-by: dholmes

! src/hotspot/share/opto/indexSet.hpp