hg: panama/dev: 8225167: add NativeTypes.SCHAR signed char type

[ningsheng.jian at arm.com]

Changeset: 3206f873be7e
Author:    ngasson
Date:      2019-06-06 12:50 +0800
URL:       http://hg.openjdk.java.net/panama/dev/rev/3206f873be7e

8225167: add NativeTypes.SCHAR signed char type
Reviewed-by: mcimadamore

! src/java.base/share/classes/java/foreign/NativeTypes.java