Ensure constant truncation is only done when it is safe.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 3c4482547a2af701f56c740e047a4d8e287d7105..4936a16ca30c1f4bb74acff37a0b6bf2c90dc2b5 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2575,10 +2575,6 @@ Maybe<HConstant*> HConstant::CopyToTruncatedInt32(Zone* zone) {
                               Representation::Integer32(),
                               is_not_in_new_space_,
                               handle_);
-  } else {
-    ASSERT(!HasNumberValue());
-    Maybe<HConstant*> number = CopyToTruncatedNumber(zone);
-    if (number.has_value) return number.value->CopyToTruncatedInt32(zone);
   }
   return Maybe<HConstant*>(res != NULL, res);
 }