[PATCH] R600/SI: Set isAllocatable = 0 on special register classes.

[Matt Arsenault]

I'm not sure if this fixes any real problems.
copyPhysReg already has a comment that SCC should never be copied,
so set CopyCost = -1.
    
These all seem obviously not allocatable, but I'm not sure about VCC
since most instructions that use it can also use an arbitrary SGPR
pair instead.

http://reviews.llvm.org/D5686

Files:
  lib/Target/R600/SIRegisterInfo.td
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