message: global_heap: fix GCC warning
diff: @@ -286,7 +286,7 @@ void GlobalHeap::meshLocked(MiniHeap *dst, MiniHeap *&src) {
  size_t GlobalHeap::meshSizeClassLocked(size_t sizeClass, MergeSetArray &mergeSets, SplitArray &left,
  SplitArray &right) {
  size_t mergeSetCount = 0;
  - memset(&mergeSets, 0, sizeof(mergeSets));
  + memset(reinterpret_cast<void *>(&mergeSets), 0, sizeof(mergeSets));
  memset(&left, 0, sizeof(left));
  memset(&right, 0, sizeof(right));
  