CR bits are now resident in registers instead of being baked into the instruction definitions. Same for XER SO, and LWARX reservation EA and value.
Reworked LWARX/STWCX, CRxx ops, compare and branch instructions. As well as RC bit handling. Not all CR-related instructions are reimplemented yet.
Introduced atomic_cmp_store operation to allow implementing STWCX in architecture agnostic IML
Removed legacy CR-based compare and jump operations
Carry bit is now resident in a register-allocated GPR instead of being backed directly into IML instructions
All the PowerPC carry ADD* and SUB* instructions as well as SRAW/SRAWI have been reworked to use more generalized IML instructions for handling carry
IML instructions now support two named output registers instead of only one (easily extendable to arbitrary count)
Storing the condition result in a register instead of imitating PPC CR lets us simplify the backend a lot. Only implemented as PoC for BDZ/BDNZ so far.
