Go benchmark helper scripts

bench-committed

#!/usr/bin/env bash
num=$1
if [[ -z $num ]] ; then 
  num=1
fi
benchmarks=$2
if [[ -z $benchmarks ]] ; then 
  benchmarks="."
fi
git checkout "HEAD~${num}" > /dev/null 2>&1
go test -run=XXX -benchmem=true -bench="${benchmarks}" > old.txt
git checkout master > /dev/null > /dev/null 2>&1
go test -run=XXX -benchmem=true -bench="${benchmarks}" > new.txt
benchcmp -mag=true old.txt new.txt
rm old.txt new.txt

bench-uncommitted

#!/usr/bin/env bash
benchmarks=$1
if [[ -z $benchmarks ]] ; then 
  benchmarks="."
fi
git stash > /dev/null 2>&1
go test -run=XXX -benchmem=true -bench="${benchmarks}" > old.txt
git stash pop > /dev/null 2>&1
go test -run=XXX -benchmem=true -bench="${benchmarks}" > new.txt
benchcmp -mag=true old.txt new.txt
rm old.txt new.txt