revamping code to appropriately handle FP condition code and conversion ops.

revamping code to appropriately handle FP condition code and conversion ops.

There still needs to be a work around to handle the paired singles operations ...

arch/mips/isa/decoder.isa:
    More revamping of the floating point ops in decoder.isa. Change all of the
    "convert and round" functions to fpConvert. Also, the utility functions
    roundFP, truncFP, and unorderedFP are in place everywhere. Things
    have been set up to appropriately use the FP condition codes in the decoder.isa
    The fp.isa format file and the isa_traits.cc file now needed to be updated
    to implement the appropriate "backend" operations/functionality...
arch/mips/isa_traits.hh:
    Remove convert & round functions
    Add roundFP, truncFP,unorderedFP, and the get/setFPconditionCode
    functions
arch/mips/isa_traits.cc:
    Add utility functions

--HG--
extra : convert_revision : 3d6708388abae5b432467f528d52e6343afecd9c