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

runtime/vm/flow_graph_inliner.h

Index: runtime/vm/flow_graph_inliner.h
diff --git a/runtime/vm/flow_graph_inliner.h b/runtime/vm/flow_graph_inliner.h
index ad1b222f7fd40d0ed7dbf1f19ff10bdf1617d72c..ccf7d3924a687a97327db4264b25f8cde2cef35b 100644
--- a/runtime/vm/flow_graph_inliner.h
+++ b/runtime/vm/flow_graph_inliner.h
@@ -19,7 +19,6 @@ class InstanceCallInstr;
 class Instruction;
 class StaticCallInstr;
 class TargetEntryInstr;
-class Precompiler;
 
 class FlowGraphInliner : ValueObject {
  public:
@@ -28,8 +27,7 @@ class FlowGraphInliner : ValueObject {
                    GrowableArray<TokenPosition>* inline_id_to_token_pos,
                    GrowableArray<intptr_t>* caller_inline_id,
                    bool use_speculative_inlining,
-                   GrowableArray<intptr_t>* inlining_black_list,
-                   Precompiler* precompiler);
+                   GrowableArray<intptr_t>* inlining_black_list);
 
   // The flow graph is destructively updated upon inlining.
   void Inline();
@@ -79,7 +77,6 @@ class FlowGraphInliner : ValueObject {
   const bool trace_inlining_;
   const bool use_speculative_inlining_;
   GrowableArray<intptr_t>* inlining_black_list_;
-  Precompiler* precompiler_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphInliner);
 };