Make loaders use translation port instead of proxy memory.

Make loaders use translation port instead of proxy memory.

Also start compiling Simple CPU again.

SConscript:
    Start Compiling Simple CPU as well
base/loader/aout_object.cc:
base/loader/aout_object.hh:
base/loader/ecoff_object.cc:
base/loader/ecoff_object.hh:
base/loader/elf_object.cc:
base/loader/elf_object.hh:
base/loader/object_file.hh:
sim/process.cc:
sim/process.hh:
    Convert loaders to used translation port instead of proxy memory

--HG--
extra : convert_revision : 63275071f6a0e0d71935641205b203d94381ee44