hg: panama/dev: 8218769: Offset of union fields are not calculated correctly

[henry.jen at oracle.com]

Changeset: 28befb7532c8
Author:    henryjen
Date:      2019-02-11 18:45 -0800
URL:       http://hg.openjdk.java.net/panama/dev/rev/28befb7532c8

8218769: Offset of union fields are not calculated correctly
Reviewed-by: mcimadamore

! src/java.base/share/classes/jdk/internal/foreign/LayoutPaths.java
+ test/jdk/java/foreign/types/UnionTest.java