Add fast-path for ret instructions
Add backpatching of ret code
Add {add,sub}_reg_near_ptr and shr_reg_u8
Replace depth code with calculations off the frame stack
Fix cmp_reg_offset_ptr_reg for 64-bit mode
Fix declaration of sub_reg_near_ptr
Add jmp_near_label
Remove left-over logging code
Fix backpatch logic when context is about to be destroyed
Fix short vs near 64-bit regressions
Tune register allocation to avoid unintentional clobbers on 64-bit
Add a workaround for 64-bit syscall issue
Also consider block ended at CALL