partitioned execution: pass process rank to LWK

Cherry-pick of d2d134d5e6a4b16a34d55d31b14614a2a91ecf47

Conflicts:
	kernel/include/process.h

executer/kernel/mcctrl/mcctrl.h

@@ -316,6 +316,7 @@ struct mcctrl_part_exec {
 	struct mutex lock;	
 	int nr_processes;
 	int nr_processes_left;
+	int process_rank;
 	cpumask_t cpus_used;
 	struct list_head pli_list;
 };