Fix Load/Store Queue squashing after a SMT thread is removed but ensuring

you are squashing from the current instruction # causing the thread exit.

--HG--
extra : convert_revision : ccbeece7dd1d5fee43f30ab19370908972113473

src/cpu/o3/cpu.cc

@@ -695,7 +695,7 @@ FullO3CPU<Impl>::removeThread(unsigned tid)
     decode.squash(tid);
     rename.squash(squash_seq_num, tid);
     iew.squash(tid);
-    //iew.ldstQueue.squash(squash_seq_num, tid);
+    iew.ldstQueue.squash(squash_seq_num, tid);
     commit.rob->squash(squash_seq_num, tid);