hg: panama/dev: 8229181: Add support for mapped memory segments

[maurizio.cimadamore at oracle.com]

Changeset: bbe105712a24
Author:    mcimadamore
Date:      2019-08-07 14:43 +0100
URL:       https://hg.openjdk.java.net/panama/dev/rev/bbe105712a24

8229181: Add support for mapped memory segments

+ src/java.base/share/classes/jdk/internal/access/foreign/UnmapperProxy.java
! src/java.base/share/classes/module-info.java
! src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemorySegment.java
+ src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/MappedMemoryScope.java
! test/jdk/java/foreign/TestByteBuffer.java