Minor fix for SMT Hello Worlds to finish correctly.

Minor fix for SMT Hello Worlds to finish correctly.
Still, there is a problem with the LSQ and indexing out of range in the buffer.
I havent nailed down the fix yet, but it's coming ...

src/cpu/o3/commit_impl.hh:
    add space to DPRINT
src/cpu/o3/cpu.cc:
    add newline to DPRINT
src/cpu/o3/rob.hh:
src/cpu/o3/rob_impl.hh:
    Each thread needs it's own squashedSeqNum for the case where they are both squashing at the same time and they dont
    write over each other's squash number.

--HG--
extra : convert_revision : 2155421a8b5b20e4544eea3d3c53d3e715465fa6