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0d5fad46cf
this internalizes the init checks and provides stronger synchronization with pthreads when available while still allowing VP8GetCPUInfo to be modified (mostly for testing purposes). windows is left as is since a critical section or mutex would cause a leak. Change-Id: Ieb997e014f2805c0ae39c16f13337663521356f4 (cherry picked from commit d77bf512bd0c4ff53019e357a2d24f6c4e3fbefc)