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

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 26012)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -4627,7 +4627,9 @@
   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; }