[exp] Remove histogram_pt (SEGFAULT)

exp/run.d/histogram_pt.sh

-HISTOGRAM_PT_DIR=$PHOENIX_DIR/phoenix-2.0/tests/histogram
-HISTOGRAM_PT_BIN=$HISTOGRAM_PT_DIR/histogram-pthread
-HISTOGRAM_PT_INPUT=$BENCH_PATH/tmp/histogram_input.bmp
-HISTOGRAM_PT_INPUTS_DIR=$TMP_INPUTS_DIR/histogram
-
-prepare_histogram_pt() {
-    if [ ! -f $HISTOGRAM_PT_INPUTS_DIR/input ]; then
-	mkdir -p $HISTOGRAM_PT_INPUTS_DIR
-	mv $HISTOGRAM_PT_INPUT $HISTOGRAM_PT_INPUTS_DIR/input
-    fi
-}
-
-dump_volrend() {
-    sha1sum $HISTOGRAM_PT_BIN              >>$dump_program_dir/histogram_pt
-    sha1sum $HISTOGRAM_PT_INPUTS_DIR/input >>$dump_program_dir/histogram_pt
-}
-
-command_histogram_pt() {
-    echo MR_NUMPROCS=$threads MAPRED_NO_BINDING=1 $cmd_prefix $HISTOGRAM_PT_BIN $HISTOGRAM_PT_INPUTS_DIR/input
-}
-