`inline` in `inline if` should not be highlighted as a declaration

[nicolasstucki]

    inline def power(x: Double, inline n: Int): Double =
//  ^^^^^^ declaration
//                              ^^^^^^ declaration
      inline if (n == 0) 1.0
//    ^^^^^^ control flow
      else inline if (n % 2 == 1) x * power(x, n - 1)
//         ^^^^^^ control flow
      else power(x * x, n / 2)

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