RFR 8130663: 6 fields can be static fields in Global class

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8130663/ for 
https://bugs.openjdk.java.net/browse/JDK-8130663

- made 6 fields as static in Global.java
- using  lazy init sentinel as location placebolder  as well
- few other simple code cleanups.

Thanks,
-Sundar