[AMDGPU] [NFC] Fix incorrect use of bitwise operator.

[jdoerfert]

Usually you go for review or commit it without. Also, this is not NFC.

llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp

for (Function *Callee : AAEdges.getOptimisticEdges()) {
       ImplicitArgumentMask AttrMask =
           intrinsicToAttrMask(IID, NonKernelOnly, NeedsQueuePtr);
       if (AttrMask != NOT_IMPLICIT_INPUT) {
         if ((IsNonEntryFunc || !NonKernelOnly))
           removeAssumedBits(AttrMask);
       }
     }
 
-    NeedsQueuePtr |= checkForQueuePtr(A);
+    if (!NeedsQueuePtr) {
+      NeedsQueuePtr = checkForQueuePtr(A);
+    }
+
     if (NeedsQueuePtr) {
       removeAssumedBits(QUEUE_PTR);
     }
 
     return getAssumed() != OrigAssumed ? ChangeStatus::CHANGED
                                        : ChangeStatus::UNCHANGED;
   }