mcexec: introduction of --flags argument

Change-Id: If5b70bf06460fc709444d8135511c3699304d31f

kernel/include/process.h

@@ -577,6 +577,7 @@ struct process {
 	int enable_tofu;
 #endif
 	size_t straight_map_threshold;
+	unsigned long mcexec_flags;
 
 	// perf_event
 	int perf_status;

kernel/include/syscall.h

@@ -243,6 +243,7 @@ struct program_load_desc {
 #ifdef ENABLE_TOFU
 	int enable_tofu;
 #endif
+	unsigned long mcexec_flags;
 	int nr_processes;
 	int process_rank;
 	__cpu_set_unit cpu_set[PLD_CPU_SET_SIZE];