implement the readfile pseudo instruction that will read

implement the readfile pseudo instruction that will read
a realworld file.

arch/alpha/isa_desc:
arch/alpha/pseudo_inst.hh:
    implement the readfile pseudo instruction that will read a
    chunk of a realworld file.
arch/alpha/pseudo_inst.cc:
    implement the readfile pseudo instruction that will read a
    chunk of a realworld file.  The filename is a per system
    parameter and comes from the system itself.
kern/linux/linux_system.cc:
sim/system.hh:
    Create a per-system readfile parameter for use by the readfile
    pseudo instruction.  That way each system can get its own file.

--HG--
extra : convert_revision : 941b3a3e20702a6252b219ca66a6d90da2944c50