Made the "data" field of store queue entries into a character array. It's sized to...

Made the "data" field of store queue entries into a character array. It's sized to match an IntReg which was what it used to be, but we might want to make it something architecture independent. All data is now endian converted before entering the store queue entries which simplifies store to load forwarding in "trans endian" simulations, and makes twin memory ops work.

src/cpu/o3/lsq_unit.hh:
src/cpu/o3/lsq_unit_impl.hh:
    fixed twin memory operations.

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extra : convert_revision : 8fb97f98e285cd22413e06e146fa82392ac2a590