[Integrated] [foreign-memaccess] RFR: JDK-8243064: Add more support for mapped memory segments

[Maurizio Cimadamore]

Changeset: 7ac8a2a0
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
Date:      2020-04-22 21:07:26 +0000
URL:       https://git.openjdk.java.net/panama-foreign/commit/7ac8a2a0

JDK-8243073: Add support for serial confinement

Reviewed-by: jvernee

! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemorySegment.java
! src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/AbstractMemorySegmentImpl.java
! src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/MemoryScope.java
! test/jdk/java/foreign/TestSegments.java
! test/jdk/java/foreign/TestSharedAccess.java