IBSET (integer, position)

  Class:  Elemental function - Generic

  Returns the value of the first argument with the specified bit set
  to 1 (bit set).  The low-order bit is position 0.

  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |  2   |  IBSET  |   --     | INTEGER*1  | INTEGER*1   |
  |      |         | IIBSET   | INTEGER*2  | INTEGER*2   |
  |      |         | JIBSET   | INTEGER*4  | INTEGER*4   |
  |      |         | KIBSET   | INTEGER*8  | INTEGER*8   |
  +------+---------+----------+------------+-------------+