ARG_POINTER_REGNUM is included in the artificial defs of all blocks (which I think is overly conservative - just having them in the entry block def should be enough). Hence, from dataflow point of view, they are always considered initialized.I think we should probably do something similar for VIRTUAL_STACK_*_REGNUM.
I think we should assert that we don't find virtual regs in dataflow, instead.
Paolo
