Fix http://dartbug.com/23578:

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
diff --git a/runtime/vm/flow_graph_optimizer.cc b/runtime/vm/flow_graph_optimizer.cc
index c51d95235459050703779b2154213b14c5bcb81b..2db078f4b423afbaee61bad65e8a6e18f191df67 100644
--- a/runtime/vm/flow_graph_optimizer.cc
+++ b/runtime/vm/flow_graph_optimizer.cc
@@ -1231,7 +1231,7 @@ bool FlowGraphOptimizer::InlineSetIndexed(
                                    call->GetBlock()->try_index());
   (*entry)->InheritDeoptTarget(Z, call);
   Instruction* cursor = *entry;
-  if (I->TypeChecksEnabled()) {
+  if (I->flags().type_checks()) {
     // Only type check for the value. A type check for the index is not
     // needed here because we insert a deoptimizing smi-check for the case
     // the index is not a smi.
@@ -4570,7 +4570,7 @@ bool FlowGraphOptimizer::TryInlineInstanceSetter(InstanceCallInstr* instr,
                                                  const ICData& unary_ic_data) {
   ASSERT((unary_ic_data.NumberOfChecks() > 0) &&
       (unary_ic_data.NumArgsTested() == 1));
-  if (I->TypeChecksEnabled()) {
+  if (I->flags().type_checks()) {
     // Checked mode setters are inlined like normal methods by conventional
     // inlining.
     return false;