Fix for issue 23834 (https://github.com/dart-lang/sdk/issues/23834)

runtime/vm/snapshot_test.cc

Index: runtime/vm/snapshot_test.cc
diff --git a/runtime/vm/snapshot_test.cc b/runtime/vm/snapshot_test.cc
index b314513a54a10491ef9457589e9a61827a29161e..23c687af4bc575d4dcf1a67db51e147f2a3751f8 100644
--- a/runtime/vm/snapshot_test.cc
+++ b/runtime/vm/snapshot_test.cc
@@ -863,7 +863,7 @@ class TestSnapshotWriter : public SnapshotWriter {
                        kInitialSize,
                        &forward_list_,
                        true),
-        forward_list_(SnapshotWriter::FirstObjectId()) {
+        forward_list_(kMaxPredefinedObjectIds) {
     ASSERT(buffer != NULL);
     ASSERT(alloc != NULL);
   }
@@ -1582,8 +1582,7 @@ TEST_CASE(IntArrayMessage) {
   ApiNativeScope scope;
   ApiMessageReader api_reader(buffer,
                               writer.BytesWritten(),
-                              &zone_allocator,
-                              false);
+                              &zone_allocator);
   Dart_CObject* root = api_reader.ReadMessage();
   EXPECT_EQ(Dart_CObject_kArray, root->type);
   EXPECT_EQ(kArrayLength, root->value.as_array.length);