Fuse Comparison->BooleanNegate->Branch.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 8878)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -2312,7 +2312,8 @@
         value_(value),
         true_successor_(NULL),
         false_successor_(NULL),
-        is_fused_with_comparison_(false) { }
+        is_fused_with_comparison_(false),
+        is_negated_(false) { }
 
   DECLARE_INSTRUCTION(Branch)
 
@@ -2349,12 +2350,15 @@
   }
 
   bool is_fused_with_comparison() const { return is_fused_with_comparison_; }
+  bool is_negated() const { return is_negated_; }
+  void set_is_negated(bool value) { is_negated_ = value; }
 
  private:
   Value* value_;
   TargetEntryInstr* true_successor_;
   TargetEntryInstr* false_successor_;
   bool is_fused_with_comparison_;
+  bool is_negated_;
 
   DISALLOW_COPY_AND_ASSIGN(BranchInstr);
 };