Don't ignore the actual input representation in UnaryMathOperations

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4a8a406eb3befbc126c4f0f6aa15119892ef316f..01dc8dfaee5e1cb41ca0c66281c0f1f45893080d 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2645,6 +2645,7 @@ class HUnaryMathOperation: public HTemplateInstruction<2> {
   }
 
   virtual HValue* Canonicalize();
+  virtual Representation RepresentationFromInputs();
 
   BuiltinFunctionId op() const { return op_; }
   const char* OpName() const;