* on i8086 with regvars on, do not notify the register allocator of moves to BX.
  This fixes compilation of unit math (and the whole RTL) with regvars enabled.



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26282 3ad0048d-3df7-0310-abae-a5850022a9f2