Used to determine whether a given IP value represents an AST
    dispatch frame.

    Format
      LIB$X86_IS_AST_DISPATCH_FRAME (ip_value)

1  –  Returns

 status

    Returns 1 if the operating system-specific data area is present
    and the AST_FRAME flag is set.
    Returns 0 if the operating system-specific data area is present
    and the AST_FRAME flag is clear.
    Returns 0 if the operating system-specific data area is not
    present.

2  –  Argument

 ip_value

    OpenVMS usage: IP value
    type:          quadword
    access:        read
    mechanism:     by reference

    Address of a quadword that contains the IP value. The ip_value
    is used to find the operating system-specific data area in the
    unwind information block for this routine.