hg: jdk/jdk: 8230373: Use java.io.Serial in generated exception types

[joe.darcy at oracle.com]

Changeset: 1262b3ddd7e4
Author:    darcy
Date:      2019-08-31 09:18 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/1262b3ddd7e4

8230373: Use java.io.Serial in generated exception types
Reviewed-by: erikj, alanb

! make/scripts/genExceptions.sh