Recognize and optimize a.runtimeType == b.runtimeType pattern.

runtime/vm/aot_optimizer.h

Index: runtime/vm/aot_optimizer.h
diff --git a/runtime/vm/aot_optimizer.h b/runtime/vm/aot_optimizer.h
index f35536c681b409c6cf790724725c6b346ce6719e..9f77dd08798fcb040afbe7440b0355183b8ef5e2 100644
--- a/runtime/vm/aot_optimizer.h
+++ b/runtime/vm/aot_optimizer.h
@@ -13,15 +13,18 @@ namespace dart {
 class CSEInstructionMap;
 template <typename T> class GrowableArray;
 class ParsedFunction;
+class Precompiler;
 class RawBool;
 
 class AotOptimizer : public FlowGraphVisitor {
  public:
   AotOptimizer(
+      Precompiler* precompiler,
       FlowGraph* flow_graph,
       bool use_speculative_inlining,
       GrowableArray<intptr_t>* inlining_black_list)
       : FlowGraphVisitor(flow_graph->reverse_postorder()),
+        precompiler_(precompiler),
         flow_graph_(flow_graph),
         use_speculative_inlining_(use_speculative_inlining),
         inlining_black_list_(inlining_black_list) {
@@ -106,6 +109,8 @@ class AotOptimizer : public FlowGraphVisitor {
 
   void ReplaceCall(Definition* call, Definition* replacement);
 
+  bool RecognizeRuntimeTypeGetter(InstanceCallInstr* call);
+
   bool InstanceCallNeedsClassCheck(InstanceCallInstr* call,
                                    RawFunction::Kind kind) const;
 
@@ -136,6 +141,7 @@ class AotOptimizer : public FlowGraphVisitor {
 
   bool IsAllowedForInlining(intptr_t deopt_id);
 
+  Precompiler* precompiler_;
   FlowGraph* flow_graph_;
 
   const bool use_speculative_inlining_;