gcc: Add extra parens to quell warnings.

Even though we're not incorrect about operator precedence, let's add
some parens in some particularly confusing places to placate GCC 4.3
so that we don't have to turn the warning off.  Agreed that this is a
bit of a pain for those users who get the order of operations correct,
but it is likely to prevent bugs in certain cases.

src/cpu/o3/cpu.cc

@@ -604,7 +604,7 @@ FullO3CPU<Impl>::suspendContext(int tid)
     DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
     bool deallocated = deallocateContext(tid, false, 1);
     // If this was the last thread then unschedule the tick event.
-    if (activeThreads.size() == 1 && !deallocated ||
+    if ((activeThreads.size() == 1 && !deallocated) ||
         activeThreads.size() == 0)
         unscheduleTickEvent();
     _status = Idle;