[LLVMdev] commit r152019 broke architectures with more than 255 registers

[Heikki Kultala]

Our architecture(TCE) can have LOTS of registers.

It seems r152019 changed some register bookkeeping data structures to 
8-bit. This broke support for architectures with >255 registers.

Please revert this change or make those register-related values at least 
16 bits wide.