Heap-allocate 'loop_body' in forall_here_async so it doesn't block.
Heap-allocate 'loop_body' in forall_here_async so it doesn't block.

This was causing deadlock problems in BC because it was using up all the
tasks waiting on the completion event.

alexfrolov/grappa,buaasun/grappa,buaasun/grappa,alexfrolov/grappa,alexfrolov/grappa,buaasun/grappa,buaasun/grappa,uwsampa/grappa,buaasun/grappa,alexfrolov/grappa,uwsampa/grappa,uwsampa/grappa,alexfrolov/grappa,uwsampa/grappa,uwsampa/grappa,alexfrolov/grappa,uwsampa/grappa,alexfrolov/grappa,uwsampa/grappa,buaasun/grappa,buaasun/grappa