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Increase thread stack for OS X (official-stockfish#2035)
On OS X threads other than the main thread are created with a reduced stack size of 512KB by default, this is dangerously low for deep searches, so adjust it to TH_STACK_SIZE. The implementation calls pthread_create() with proper stack size parameter. Verified for no regression at STC enabling the patch on all platforms where pthread is supported. LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 50873 W: 9768 L: 9700 D: 31405 No functional change.
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