Adding ATMI as the runtime layer to launch Chapel's generated GPU ker…#13

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ashwinma wants to merge 10 commits intochpl-hsa-masterfrom chpl-atmi

+2,160-38

Commits on Jun 14, 2017

Adding ATMI as the runtime layer to launch Chapel's generated GPU kernels
ashwinma
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ATMI as the new heterogeneous tasking layer -- 1st pass
ashwinma
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Updated ATMI tasking layer to master branch; ATMI layer should be called by setting the CHPL_TASKS to atmi instead of qthreads
ashwinma
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Extended Chapel tasking interface to use more of ATMI
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minor bug fix for constant expression
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[Feature] cobegin uses ATMI for CPU task management. But, TARGET_HSA should be enabled to do that, but it is just conforming to the rest of our conditional compilation strategy anyway.
ashwinma
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[Bug fix] Minor fix for conditional compilation and returning 0 as the chpl-atmi null task instead of -1. Rationale to return 0 instead of chpl_nullTaskID: ATMI returns -1 as the NULL
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added support for coforall in ATMI
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enabled sync statement to use ATMI
ashwinma
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Recycling task groups and at the same time, fixing the max depth of nesting of coforall and cobegin blocks
ashwinma
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