patch applied (ghc): fix for the unregisterised way

[Simon Marlow]

Thu Feb  9 02:50:58 PST 2006  Simon Marlow <simonmar at microsoft.com>
  * fix for the unregisterised way
  
  We always assign to BaseReg on return from resumeThread(), but in
  cases where BaseReg is not an lvalue (eg. unreg) we need to disable
  this assigment.  See comments for more details.

    M ./ghc/compiler/cmm/PprC.hs -7 +11
    M ./ghc/includes/Regs.h +10
    M ./ghc/rts/Capability.c +8