XS RFR: 8032551: Remove UsePPCLWSYNC from globals.hpp

[David Holmes]

Trivial RFR. This SE Embedded PPC specific flag should never have been 
in the main globals.hpp file. It has now been moved to its correct place 
- so the open code just sees a deletion.

http://cr.openjdk.java.net/~dholmes/8032551/webrev/

Thanks,
David