Use shallow clone in benchmark script

Author: richardlau

Diff for: benchmarks/community-benchmark/run.sh

@@ -76,7 +76,7 @@ getMACHINE_THREADS=`cat /proc/cpuinfo |grep processor|tail -n1|awk {'print $3'}`
 let getMACHINE_THREADS=getMACHINE_THREADS+1 #getting threads this way is 0 based. Add one
 optional MACHINE_THREADS $getMACHINE_THREADS
 rm -rf node
-git clone https://github.com/nodejs/node.git
+git clone --depth=1 https://github.com/nodejs/node.git
 cd node
 case $USE_CASE in
 1)