Make sure Bigint._digits is always a Uint32List (instead of sometimes null).

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/class_finalizer.h"
@@ skipping 3293 matching lines @@
             new CreateArrayInstr(node->token_pos(), element_type, length);
         return ReturnDefinition(create_array);
       }
       case MethodRecognizer::kBigint_getDigits: {
         Value* receiver = Bind(BuildLoadThisVar(node->scope()));
         LoadFieldInstr* load = new(I) LoadFieldInstr(
             receiver,
             Bigint::digits_offset(),
             Type::ZoneHandle(I, Type::DynamicType()),
             node->token_pos());
-        // TODO(srdjan): Enabling the correct result type throws an NPE.
-        // load->set_result_cid(kTypedDataUint32ArrayCid);
-        load->set_result_cid(kDynamicCid);
+        load->set_result_cid(kTypedDataUint32ArrayCid);
         load->set_recognized_kind(kind);
         return ReturnDefinition(load);
       }
       case MethodRecognizer::kBigint_getUsed: {
         Value* receiver = Bind(BuildLoadThisVar(node->scope()));
         LoadFieldInstr* load = new(I) LoadFieldInstr(
             receiver,
             Bigint::used_offset(),
             Type::ZoneHandle(I, Type::SmiType()),
             node->token_pos());
@@ skipping 960 matching lines @@
   Report::MessageF(Report::kBailout,
                    Script::Handle(function.script()),
                    function.token_pos(),
                    "FlowGraphBuilder Bailout: %s %s",
                    String::Handle(function.name()).ToCString(),
                    reason);
   UNREACHABLE();
 }
 
 }  // namespace dart