patch applied (ghc): SPARC NCG: Add a comment explaining why we can't used a pinned reg for gct

[Ben Lippmeier]

Mon Apr 20 00:43:35 PDT 2009  Ben.Lippmeier at anu.edu.au
  * SPARC NCG: Add a comment explaining why we can't used a pinned reg for gct
  Can't use windowed regs because the window moves during a function
  call. Can't use the global regs because they're reserved for other purposes.

    M ./rts/sm/GCThread.h -3 +20

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090420074335-43c66-652ddc106c4d8534f3ae54974ec3bd7df3d5c78d.gz