[MIPS] MT: Fix setting of XTC.

XTC can only be set if VPA is clear, which it may not be. There is
also the possibility of a back to back c0 register access hazard to
take care of.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Elizabeth Oldham 2006-08-17 12:39:21 +01:00 committed by Ralf Baechle
commit a94d702049