[PATCH] correct llvm::sys::Memory thread-safety

[Jim Kearney]

Please review the attached patch which is intended to fix 
http://llvm.org/bugs/show_bug.cgi?id=15749. If it's acceptable, please 
commit it.

It replaces an auto static with a ManagedStatic<> to eliminate a race in 
multithreaded code generation (on some platforms/compilers).

Thanks,
J. Kearney

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