title: iOS: float16_t does not work on simulator
body: <p>I tried to use the <code>float16_t</code> type in my iOS app to save memory space. It seems to work perfectly on device, but it does not build on simulator.</p>
  
  <p>In the simulator build it fails with</p>
  
  <blockquote>
    <p>Unknown type name 'float16_t'; did you mean 'float_t'?</p>
  </blockquote>
  
  <p>The <code>float16_t</code> seems to be defined in arm_neon.h.</p>
  
  <p>Can this be fixed so that I can use that type on simulator?</p>