8197842: Remove unused macros VM_STRUCTS_EXT and VM_TYPES_EXT
Reviewed-by: sjohanss, lfoltan
Welcome to OpenJDK!
===================
For information about building OpenJDK, including how to fully retrieve all
source code, please see either of these:
* doc/building.html (html version)
* doc/building.md (markdown version)
See http://openjdk.java.net/ for more information about OpenJDK.