Adding ATMI as the runtime layer to launch Chapel's generated GPU ker… #13
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…led by setting the CHPL_TASKS to atmi instead of qthreads
…should be enabled to do that, but it is just conforming to the rest of our conditional compilation strategy anyway.
…e chpl-atmi null task instead of -1. Rationale to return 0 instead of chpl_nullTaskID: ATMI returns -1 as the NULL task, but we maintain 0 as the null task in chpl-atmi. Impl: chpl-atmi does not create a new task for the main wrapper. Instead it creates a dummy ATMI task in the beginning but does not launch/activate it. This helps us recognize 0 as the main/dummy task and not -1 that is expected by ATMI as the NULL task.
…esting of coforall and cobegin blocks
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…nels