mimalloc: Segmentation fault on Apple Silicon / arm64

Building mimalloc fails in the TLS initialization with a segmentation fault:

% lldb ./mimalloc-test-api
(lldb) target create "./mimalloc-test-api"
Current executable set to '/Users/uwe/Development/mimalloc/build/mimalloc-test-api' (arm64).
(lldb) run
Process 17703 launched: '/Users/uwe/Development/mimalloc/build/mimalloc-test-api' (arm64)
mimalloc-test-api was compiled with optimization - stepping may behave oddly; variables may not be available.
Process 17703 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x000000010001f264 mimalloc-test-api`_mi_process_init [inlined] mi_tls_slot(slot=0) at mimalloc-internal.h:711:9 [opt]
   708 	#elif defined(__aarch64__)
   709 	  void** tcb; UNUSED(ofs);
   710 	  __asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
-> 711 	  res = tcb[slot];
   712 	#endif
   713 	  return res;
   714 	}
Target 0: (mimalloc-test-api) stopped.