hg: jdk/sandbox: flatmap-branch: re-added default implementation

[patrick.concannon at oracle.com]

Changeset: c1649261c0b2
Author:    pconcannon
Date:      2020-03-20 22:29 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/c1649261c0b2

flatmap-branch: re-added default implementation

+ src/java.base/share/classes/java/util/stream/FlatMapConsumer.java
! src/java.base/share/classes/java/util/stream/ReferencePipeline.java
! src/java.base/share/classes/java/util/stream/Stream.java
! test/jdk/lib/testlibrary/bootlib/java.base/java/util/stream/DefaultMethodStreams.java