hg: panama/dev: 8202907: Consolidate the design and implementation of the nicl support

[henry.jen at oracle.com]

Changeset: 2157fa01f670
Author:    henryjen
Date:      2018-06-06 10:55 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/2157fa01f670

8202907: Consolidate the design and implementation of the nicl support
* tolerate empty struct

! src/java.base/share/classes/jdk/internal/nicl/types/DescriptorParser.java
! test/jdk/com/sun/tools/jextract/EmptyStructTest.java
! test/jdk/com/sun/tools/jextract/StructTest.java
! test/jdk/com/sun/tools/jextract/emptyStruct.h