Minor updates for stats.

Minor updates for stats.

src/cpu/o3/commit_impl.hh:
src/cpu/o3/fetch.hh:
    Update stats comments.
src/cpu/o3/fetch_impl.hh:
    Differentiate stats.
src/cpu/o3/iew.hh:
src/cpu/o3/iew_impl.hh:
src/cpu/o3/inst_queue.hh:
src/cpu/o3/inst_queue_impl.hh:
    Update for stats.
src/cpu/o3/lsq.hh:
    LSQ now has stats.
src/cpu/o3/lsq_impl.hh:
    Register stats of all LSQ units.
src/cpu/o3/lsq_unit.hh:
src/cpu/o3/lsq_unit_impl.hh:
    Add in stats.

--HG--
extra : convert_revision : 7672ecf3c02515b268c28d5a986af1432197654a