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			iOS 8 does not support `thread_local`, which is still in use. Another approach will have to be found. This change is a revert of the following changes: a3845240 - "Simplify PoolAlloc with use of thread_local." abf92c80 - "Deprecate InitializeDll functions" 33585c87 - "Limit visibility of symbols for internal libraries" Issue: #2346