hg: panama/dev: 8227393: Add Constable support to the layout API

[maurizio.cimadamore at oracle.com]

Changeset: 6bc2371d350b
Author:    mcimadamore
Date:      2019-07-10 18:05 +0100
URL:       http://hg.openjdk.java.net/panama/dev/rev/6bc2371d350b

8227393: Add Constable support to the layout API

! src/java.base/share/classes/java/lang/constant/ConstantDescs.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/AbstractLayout.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/GroupLayout.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemoryLayout.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/PaddingLayout.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/SequenceLayout.java
! src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/ValueLayout.java
+ test/jdk/java/foreign/TestLayoutConstants.java