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Latest commit a30f902 Aug 23, 2016 @Keno Keno committed with rocallahan If the address space is forked, keep the thread local initialization …

A priori, there's nothing wrong with keeping the existing TLS descriptor
if the VM is forked, since the two threads won't clobber each other.
This fixes a performance problem in single threaded processes that
fork (where thread locals get initialized only because of the preload
library), since the forked process would never set a new TLS descriptor.