* use pointer arithmetic for doing address calculations, with a newly introduced
  pointer type TTinyHeapPointerArithmeticType, instead of using ptruint. This
  will allow us to use a huge pointer in i8086 far data memory models, in order
  to allow the heap to exceed 64k.



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28247 3ad0048d-3df7-0310-abae-a5850022a9f2