Modified the code to compile with the new LLVM version.
Merge branch 'master' of github.com:Peppar/llvm-C65

Conflicts:
	C65ISelDAGToDAG.cpp
	C65ISelLowering.cpp
	C65InstrInfo.td
	C65RegisterInfo.cpp
	C65RegisterInfo.td
Filling in information about 8-bit registers.
About to redo addressing modes, believing that only one mem_ix16.. etc is needed.
Got things compiling, adding 8 and 16-bit accumulator versions of certain instructions.