This switches CrashRecoveryContext to using ManagedStatic for its global Mutex and 
global ThreadLocals, thereby getting rid of the load-time initialization of those 
objects and also getting rid of their destruction unless the LLVM client calls 
llvm_shutdown.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190617 91177308-0d34-0410-b5e6-96231b3b80d8