VM: [DBC] Fix lazy deoptimization after calls that return no values.

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 6d103b889c9a06c294e65bf0bc2150e6bc9a12b1..526690ab5a4954c6fbac52ecae08d1f92869a149 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -815,7 +815,7 @@ void FlowGraphCompiler::AddStubCallTarget(const Code& code) {
 }
 
 
-void FlowGraphCompiler::AddDeoptIndexAtCall(intptr_t deopt_id) {
+CompilerDeoptInfo* FlowGraphCompiler::AddDeoptIndexAtCall(intptr_t deopt_id) {
   ASSERT(is_optimizing());
   ASSERT(!intrinsic_mode());
   CompilerDeoptInfo* info =
@@ -824,6 +824,7 @@ void FlowGraphCompiler::AddDeoptIndexAtCall(intptr_t deopt_id) {
                                      pending_deoptimization_env_);
   info->set_pc_offset(assembler()->CodeSize());
   deopt_infos_.Add(info);
+  return info;
 }