Fix issue 12369: compare kind of unary math instruction and not only the inputs to determine if at…

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 4609 matching lines @@
     // was inherited from another instruction that could deoptimize.
     return deopt_id_;
   }
 
   DECLARE_INSTRUCTION(MathUnary)
   virtual CompileType ComputeType() const;
 
   virtual bool AllowsCSE() const { return true; }
   virtual EffectSet Effects() const { return EffectSet::None(); }
   virtual EffectSet Dependencies() const { return EffectSet::None(); }
-  virtual bool AttributesEqual(Instruction* other) const { return true; }
+  virtual bool AttributesEqual(Instruction* other) const {
+    return kind() == other->AsMathUnary()->kind();
+  }
 
   virtual bool MayThrow() const { return false; }
 
  private:
   const MethodRecognizer::Kind kind_;
 
   DISALLOW_COPY_AND_ASSIGN(MathUnaryInstr);
 };
 
 
@@ skipping 1976 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_