hg: jdk/sandbox: flatmap-branch: add ReferencePipeline impl with contained buffer

[julia.boes at oracle.com]

Changeset: 46d66a811ac2
Author:    jboes
Date:      2020-03-20 15:59 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/46d66a811ac2

flatmap-branch: add ReferencePipeline impl with contained buffer

! src/java.base/share/classes/java/util/stream/ReferencePipeline.java
! src/java.base/share/classes/java/util/stream/Stream.java
! test/jdk/java/util/stream/test/org/openjdk/tests/java/util/stream/BiConsumerFlatMapOpTest.java
! test/jdk/lib/testlibrary/bootlib/java.base/java/util/stream/DefaultMethodStreams.java