Hotfix: set last_data_check_epoch to not deadlock

With ICLDisco/parsec#694 PaRSEC will have
a proper initializer for gpu task structures but until then
we need to properly initialize this field to something non-zero.

Signed-off-by: Joseph Schuchart <joseph.schuchart@stonybrook.edu>

Author: devreal

ttg/ttg/parsec/ttg.h

@@ -1493,7 +1493,7 @@ namespace ttg_parsec {
         PARSEC_OBJ_CONSTRUCT(gpu_task, parsec_list_item_t);
         gpu_task->ec = parsec_task;
         gpu_task->task_type = 0; // user task
-        gpu_task->last_data_check_epoch = 0; // used internally
+        gpu_task->last_data_check_epoch = (uint64_t)-1; // used internally
         gpu_task->pushout = 0;
         gpu_task->submit = &TT::device_static_submit;