[PATCH] correct GDBRegistrar thread-safety

[Jim Kearney]

Please review the attached patch which is intended to fix 
http://llvm.org/bugs/show_bug.cgi?id=15750. If it's acceptable, please 
commit it.

It fixes two problems:
- use ManagedStatic<> to avoid initialization order problems
- lock when modifying singleton state; incorrect locking here caused 
multi-threaded MCJIT to core due to races.

Thanks,
J. Kearney


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