Revert "The current growth strategy for growable arrays allocates a backing array of size 2 at (emp…

runtime/vm/gc_sweeper.cc

Index: runtime/vm/gc_sweeper.cc
diff --git a/runtime/vm/gc_sweeper.cc b/runtime/vm/gc_sweeper.cc
index 2860292406e1481c093d37c17ecd086b1fc7d838..738e1b874ef60dde75cc2db6145a31158b222da0 100644
--- a/runtime/vm/gc_sweeper.cc
+++ b/runtime/vm/gc_sweeper.cc
@@ -81,8 +81,8 @@ intptr_t GCSweeper::SweepLargePage(HeapPage* page) {
     words_to_end = (raw_obj->Size() >> kWordSizeLog2);
   }
 #ifdef DEBUG
-  // String::MakeExternal and Array::MakeFixedLength create trailing filler
-  // objects, but they are always unreachable. Verify that they are not marked.
+  // String::MakeExternal and Array::MakeArray create trailing filler objects,
+  // but they are always unreachable. Verify that they are not marked.
   uword current = RawObject::ToAddr(raw_obj) + raw_obj->Size();
   uword end = page->object_end();
   while (current < end) {