Implements the Alpha __PAL_GENTRAP and __PAL_BUGCHK built-in
  functions on OpenVMS I64 systems.

  The __break2 function is equivalent to the __break function with
  the second parameter passed in general register 17:

  R17 = __R17_value; __break (__break_code);

  Syntax:

       void __break2 (__Integer_Constant __break_code, unsigned
       __int64 __r17_value);