Minor changes for FP ... MIPS now works for floating-point programs...

Minor changes for FP ...  MIPS now works for floating-point programs...
Now we are to the point where more benchmarks and instruction-coverage
is necessary to totally verify/validate correct operation across
all MIPS instructions

arch/mips/isa_traits.hh:
    fix for reading double values ... must rearrange bits before using void* to read double.
configs/test/hello_mips:
    real hello world MIPS binary

--HG--
extra : convert_revision : 153de1f8a830882c6972bd0bdb56da818f614def