Use if else to potentially avoid conditional

libcudacxx/include/cuda/std/__memory/assume_aligned.h

@@ -33,18 +33,19 @@ template <size_t _Align, class _Tp>
 _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI _CCCL_CONSTEXPR_CXX14 _Tp* assume_aligned(_Tp* __ptr) noexcept
 {
   static_assert(_CUDA_VSTD::has_single_bit(_Align), "std::assume_aligned requires the alignment to be a power of 2!");
-#if defined(_CCCL_BUILTIN_IS_CONSTANT_EVALUATED)
+#if defined(_CCCL_BUILTIN_IS_CONSTANT_EVALUATED) && defined(_CCCL_BUILTIN_ASSUME_ALIGNED)
   if (!_CCCL_BUILTIN_IS_CONSTANT_EVALUATED())
   {
 #  if !defined(_CCCL_COMPILER_MSVC) // MSVC checks within the builtin
     _CCCL_ASSERT(reinterpret_cast<uintptr_t>(__ptr) % _Align == 0, "Alignment assumption is violated");
 #  endif // !_CCCL_COMPILER_MSVC
-#  if defined(_CCCL_BUILTIN_ASSUME_ALIGNED)
     return static_cast<_Tp*>(__builtin_assume_aligned(__ptr, _Align));
-#  endif // _CCCL_BUILTIN_ASSUME_ALIGNED
   }
-#endif // _CCCL_BUILTIN_IS_CONSTANT_EVALUATED
-  return __ptr;
+  else
+#endif // _CCCL_BUILTIN_IS_CONSTANT_EVALUATED && _CCCL_BUILTIN_ASSUME_ALIGNED
+  {
+    return __ptr;
+  }
 }
 
 _LIBCUDACXX_END_NAMESPACE_STD