Split up kernel.cc into separate files for dump_mbuf and printf

Split up kernel.cc into separate files for dump_mbuf and printf

cpu/exec_context.hh:
dev/alpha_console.cc:
sim/system.cc:
sim/system.hh:
    Convert from fixed array to a vector
arch/alpha/arguments.hh:
    now that CopyData and CopyString are in vtophys.hh, this
    include is not necessary
arch/alpha/vtophys.hh:
    Include isa_traits.hh for Addr
cpu/pc_event.cc:
    Temporarily get this working while we're changing things

--HG--
extra : convert_revision : 9a7597b7bd5d050819766f8edf7a02f28447b9ca