add write/read functions that have endian conversions in them

when we get a virtual port delete it (even though delete does nothing in these cases)

src/arch/alpha/linux/system.cc:
src/arch/alpha/stacktrace.cc:
src/base/remote_gdb.cc:
src/cpu/simple_thread.cc:
    when we get a virtual port delete it (even though delete does nothing in this case)
src/mem/port.hh:
src/mem/vport.hh:
    add write/read functions that have endian conversions in them

--HG--
extra : convert_revision : 163e05cc038c461f95c92f8ce55422033f9ea513

src/cpu/simple_thread.cc

@@ -314,9 +314,10 @@ SimpleThread::getVirtPort(ThreadContext *src_tc)
 void
 SimpleThread::delVirtPort(VirtualPort *vp)
 {
-//    assert(!vp->nullThreadContext());
-    delete vp->getPeer();
-    delete vp;
+    if (vp != virtPort) {
+        delete vp->getPeer();
+        delete vp;
+    }
 }