Ensure constant truncation is only done when it is safe.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index bf51aa7f3a5aefd9ff345b53eb855563f1265b7e..ef5a4148204e7946d058193ca14a98cb2aba4481 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -7694,10 +7694,11 @@ bool CanBeZero(HValue* right) {
 HValue* HGraphBuilder::TruncateToNumber(HValue* value, Handle<Type>* expected) {
   if (value->IsConstant()) {
     HConstant* constant = HConstant::cast(value);
-    Maybe<HConstant*> number = constant->CopyToTruncatedNumber(zone());
+    Maybe<HConstant*> number =
+        constant->CopyToTruncatedNumberAndAdd(zone(), this);
     if (number.has_value) {
       *expected = handle(Type::Number(), isolate());
-      return AddInstruction(number.value);
+      return number.value;
     }
   }