Operand modifier example
asm() unique number example
Spiltting out asm constraint code - handle "rm", etc
Basic clobber checking in asm()
Clobbered registers aren't used in asm() reg alloc
Constrain fixed registers first
Handle constraint-readwrite in checker
Remove populate_constraint()
Mark fixed registers as chosen constraints during prescan
Wrap constrained values + count in a struct
More __asm/ examples
Debugging: show_regarr()
TODO: Constrain non-fixed values