implementing TR8's present map type modifier

Hi,

I am implementing OpenMP TR8’s present map type modifier. Based on OpenMPSupport.rst, no one else is pursuing it yet. Please let me know if you are.

Unless I hear objections, I’ll soon add the following entry to the OpenMP 5.1 section of OpenMPSupport.rst:


> device extension | 'present' map type modifier | :part:`claimed` | |

Thanks.

Joel