Always deoptimize on undefined if a double value implicitly gets converted.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 5d4b90a5bc5c4e70f1389d3bc7a1d01e6d088721..6fbfd15f388054854e9b39a25faac0ffa7456dfd 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1718,9 +1718,7 @@ class HChange: public HUnaryOperation {
     ASSERT(!value->representation().Equals(to));
     set_representation(to);
     SetFlag(kUseGVN);
-    if (deoptimize_on_undefined || to.IsTagged()) {
-      SetFlag(kDeoptimizeOnUndefined);
-    }
+    if (deoptimize_on_undefined) SetFlag(kDeoptimizeOnUndefined);
     if (is_truncating) SetFlag(kTruncatingToInt32);
     if (value->representation().IsSmi() || value->type().IsSmi()) {
       set_type(HType::Smi());