[OpenMP] Fix reallocation of task successors in taskgraph mode

Ensure proper resizing and copying of the successors array when its
capacity is exceeded. The previous implementation allocated a new array
but did not copy the existing elements. This led to loss of successor
data and incorrect task dependency tracking.

Author: jpinot

openmp/runtime/src/kmp_taskdeps.cpp

@@ -244,10 +244,14 @@ static inline void __kmp_track_dependence(kmp_int32 gtid, kmp_depnode_t *source,
     if (!exists) {
       if (source_info->nsuccessors >= source_info->successors_size) {
         source_info->successors_size = 2 * source_info->successors_size;
+        kmp_uint old_size = source_info->successors_size;
+        kmp_uint new_size = source_info->successors_size * 2;
         kmp_int32 *old_succ_ids = source_info->successors;
-        kmp_int32 *new_succ_ids = (kmp_int32 *)__kmp_allocate(
-            source_info->successors_size * sizeof(kmp_int32));
+        kmp_int32 *new_succ_ids =
+            (kmp_int32 *)__kmp_allocate(new_size * sizeof(kmp_int32));
+        KMP_MEMCPY(new_succ_ids, old_succ_ids, old_size * sizeof(kmp_int32));
         source_info->successors = new_succ_ids;
+        source_info->successors_size = new_size;
         __kmp_free(old_succ_ids);
       }