Fix default SMT configuration in O3CPU (i.e. fetch policy, workloads/numThreads)

Edit Test3 for newmem

src/base/traceflags.py:
    Add O3CPU flag
src/cpu/base.cc:
    for some reason adding a BaseCPU flag doesnt work so just go back to old way...
src/cpu/o3/alpha/cpu_builder.cc:
    Determine number threads by workload size instead of solely by parameter.

    Default SMT fetch policy to RoundRobin if it's not specified in Config file
src/cpu/o3/commit.hh:
    only use nextNPC for !ALPHA
src/cpu/o3/commit_impl.hh:
    add FetchTrapPending as condition for commit
src/cpu/o3/cpu.cc:
    panic if active threads is more than Impl::MaxThreads
src/cpu/o3/fetch.hh:
src/cpu/o3/inst_queue.hh:
src/cpu/o3/inst_queue_impl.hh:
src/cpu/o3/rob.hh:
src/cpu/o3/rob_impl.hh:
    name stuff
src/cpu/o3/fetch_impl.hh:
    fatal if try to use SMT branch count, that's unimplemented right now
src/python/m5/config.py:
    make it clearer that a parameter is not valid within a configuration class

--HG--
extra : convert_revision : 55069847304e40e257f9225f0dc3894ce6491b34

src/cpu/o3/commit_impl.hh

@@ -1221,7 +1221,8 @@ DefaultCommit<Impl>::roundRobin()
         unsigned tid = *pri_iter;
 
         if (commitStatus[tid] == Running ||
-            commitStatus[tid] == Idle) {
+            commitStatus[tid] == Idle ||
+            commitStatus[tid] == FetchTrapPending) {
 
             if (rob->isHeadReady(tid)) {
                 priority_list.erase(pri_iter);