Use a typed array for the irregexp stack.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index 90e5ba5f7daf9d98d18dbdeeedbff4a9100ac361..b520549b252d26f359b8ffb50923e3df6def0383 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -1661,4 +1661,22 @@ DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
   field.EvaluateInitializer();
 }
 
+
+DEFINE_RUNTIME_ENTRY(GrowRegExpStack, 1) {
+  const Array& typed_data_cell = Array::CheckedHandle(arguments.ArgAt(0));
+  ASSERT(!typed_data_cell.IsNull() && typed_data_cell.Length() == 1);
+  const TypedData& old_data = TypedData::CheckedHandle(typed_data_cell.At(0));
+  ASSERT(!old_data.IsNull());
+  const intptr_t cid = old_data.GetClassId();
+  const intptr_t old_size = old_data.Length();
+  const intptr_t new_size = 2 * old_size;
+  const intptr_t elm_size = old_data.ElementSizeInBytes();
+  const TypedData& new_data =
+      TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
+  TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
+  typed_data_cell.SetAt(0, new_data);
+  arguments.SetReturn(new_data);
+}
+
+
 }  // namespace dart