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

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 4137 matching lines @@
   bool IsPurelyInformativeDefinition() override { return true; }
 };
 
 
 class HBitwiseBinaryOperation : public HBinaryOperation {
  public:
   HBitwiseBinaryOperation(HValue* context, HValue* left, HValue* right,
                           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();
   }
 
   void RepresentationChanged(Representation to) override {
     if (to.IsTagged() &&
         (left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved())) {
       SetAllSideEffects();
       ClearFlag(kUseGVN);
     } else {
       ClearAllSideEffects();
@@ skipping 3891 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_