Fix so that O3CPU doesnt segfault on exit.

Major thing was to not execute commit if there are no active threads in CPU.

src/cpu/o3/alpha/thread_context.hh:
    call deallocate instead of deallocateContext
src/cpu/o3/commit_impl.hh:
    dont run commit stage if there are no instructions
src/cpu/o3/cpu.cc:
    add deallocate event, deactivateThread function, and edit deallocateContext.
src/cpu/o3/cpu.hh:
    add deallocate event and add optional delay to deallocateContext
src/cpu/o3/thread_context.hh:
    optional delay for deallocate
src/cpu/o3/thread_context_impl.hh:
    edit DPRINTFs to say Thread Context instead of Alpha TC
src/cpu/thread_context.hh:
    optional delay
src/sim/syscall_emul.hh:
    name stuff

--HG--
extra : convert_revision : f4033e1f66b3043d30ad98dcc70d8b193dea70b6

src/cpu/o3/commit_impl.hh

@@ -562,6 +562,9 @@ DefaultCommit<Impl>::tick()
         return;
     }
 
+    if ((*activeThreads).size() <= 0)
+        return;
+
     list<unsigned>::iterator threads = (*activeThreads).begin();
 
     // Check if any of the threads are done squashing.  Change the