Add a functional port that is used to load the original binaries in FS

SE mode now has a port that goes to whatever toplevel mem object the
CPU sees that does the appropriate translation for syscall emulation

SConscript:
    translating port is a syscall emu only source
arch/alpha/system.cc:
base/loader/object_file.cc:
base/loader/object_file.hh:
    Use the new functional port to write the binaries into memory
cpu/cpu_exec_context.cc:
cpu/cpu_exec_context.hh:
cpu/simple/cpu.cc:
    We aren't always going to be writing straight to memory with syscalls
    support writing to a cache
mem/port.hh:
    Add a simple unidirectional functional port that panics on any incoming requests
mem/translating_port.hh:
    make translating port inherit from the simple port
sim/system.cc:
sim/system.hh:
    Add a functional port that is used to load the original binaries

--HG--
extra : convert_revision : 9096866d0b23e3aceea68394abb76e63c0f8fd8d

cpu/simple/cpu.cc

@@ -169,7 +169,7 @@ SimpleCPU::SimpleCPU(Params *p)
     cpuXC = new CPUExecContext(this, 0, p->system, p->itb, p->dtb);
 #else
     cpuXC = new CPUExecContext(this, /* thread_num */ 0, p->process,
-            /* asid */ 0);
+            /* asid */ 0, mem);
 #endif // !FULL_SYSTEM
 
     xcProxy = cpuXC->getProxy();