Fix Math.round/floor that had bogus Smi representation

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 1f51b24c74ac6de37f43371fe3271e2a58fc8ef1..a4c54e761e731944247005f0b940df7804617206 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3175,8 +3175,6 @@ Representation HUnaryMathOperation::RepresentationFromInputs() {
   Representation input_rep = value()->representation();
   if (!input_rep.IsTagged()) {
     rep = rep.generalize(input_rep);
-  } else if (flexible_int()) {
-    rep = Representation::Integer32();
   }
   return rep;
 }