For background compilation we copy ICData so that it is immutable during comnpilation. However, we …

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index 8c6fa8e9a378a3a576f63ab48a6201f1eb78b36d..1082ad0ddc8d35e4da6efaee92dcdb87b00f213d 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -1118,7 +1118,8 @@ void FlowGraphCompiler::GenerateInstanceCall(
     intptr_t token_pos,
     intptr_t argument_count,
     LocationSummary* locs,
-    const ICData& ic_data) {
+    const ICData& ic_data_in) {
+  const ICData& ic_data = ICData::ZoneHandle(ic_data_in.Original());
   if (Compiler::always_optimize()) {
     EmitSwitchableInstanceCall(ic_data, argument_count,
                                deopt_id, token_pos, locs);