add annotation code to m5

configs/common/Benchmarks.py:
add annotate test app
src/SConscript:
add annotate.cc to lis
src/arch/alpha/isa/decoder.isa:
add annotate instructions
src/base/traceflags.py:
Add annotate trace flag
src/sim/pseudo_inst.cc:
src/sim/pseudo_inst.hh:
add annotate pseudo ops
util/m5/m5op.S:
util/m5/m5op.h:
add anotate ops