hg: jdk/submit: 8210347: Combine subsequent calls to Set.contains() and Set.add()

[ivan.gerasimov at oracle.com]

Changeset: 4ffb0a33f265
Author:    igerasim
Date:      2018-09-11 14:51 -0700
URL:       http://hg.openjdk.java.net/jdk/submit/rev/4ffb0a33f265

8210347: Combine subsequent calls to Set.contains() and Set.add()
Reviewed-by: smarks, bpb

! src/java.base/share/classes/java/lang/ModuleLayer.java
! src/java.base/share/classes/java/lang/module/Configuration.java
! src/java.base/share/classes/java/util/ServiceLoader.java
! src/java.base/share/classes/java/util/stream/DistinctOps.java