VM background optimization: Fix another use of the original IC data.

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 93225db913ab93d2e03d6f8a43c062ae478c2da3..2a3f9f3450bb298fa52032183d24f25fa2d5ed91 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -1188,7 +1188,7 @@ void FlowGraphCompiler::GenerateInstanceCall(
     return;
   }
   if (FLAG_always_megamorphic_calls) {
-    EmitMegamorphicInstanceCall(ic_data, argument_count,
+    EmitMegamorphicInstanceCall(ic_data_in, argument_count,
                                 deopt_id, token_pos, locs,
                                 CatchClauseNode::kInvalidTryIndex);
     return;
@@ -1216,7 +1216,7 @@ void FlowGraphCompiler::GenerateInstanceCall(
   }
 
   if (is_optimizing()) {
-    EmitMegamorphicInstanceCall(ic_data, argument_count,
+    EmitMegamorphicInstanceCall(ic_data_in, argument_count,
                                 deopt_id, token_pos, locs,
                                 CatchClauseNode::kInvalidTryIndex);
     return;