[strong] Fix weird work-around for magic truncating int conversions.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 807a65102940649f0cd132a30b2cef254810323f..4d9e3527dcbe9c9c7791e802eb1c5b5993d2ffe8 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4155,8 +4155,10 @@ class HBitwiseBinaryOperation : public HBinaryOperation {
                           Strength strength, HType type = HType::TaggedNumber())
       : HBinaryOperation(context, left, right, strength, type) {
     SetFlag(kFlexibleRepresentation);
-    SetFlag(kTruncatingToInt32);
-    if (!is_strong(strength)) SetFlag(kAllowUndefinedAsNaN);
+    if (!is_strong(strength)) {
+      SetFlag(kTruncatingToInt32);
+      SetFlag(kAllowUndefinedAsNaN);
+    }
     SetAllSideEffects();
   }