Started adding a system to output data after every instruction.

Started adding a system to output data after every instruction.

src/arch/alpha/regfile.hh:
src/arch/mips/regfile/float_regfile.hh:
src/arch/mips/regfile/int_regfile.hh:
src/arch/mips/regfile/misc_regfile.hh:
src/cpu/exetrace.hh:
    Added functions to start to support dumping register values once per cycle.
src/cpu/exetrace.cc:
    Added some code to support printing the value of registers after each cycle.
src/python/m5/main.py:
    Options to turn on output after every instruction. They are commented out.

--HG--
extra : convert_revision : 168a48a6b98ab6be412a96bdee831c71906958b0