add simple loop bench

fiddled with run numbers a bit
recording times with noop removed
results slightly worse than hoped

test/bench/go/loop.go

@@ -2,7 +2,7 @@ package main
 
 func main() {
 	sum := 1
-	for sum < 100000 {
+	for sum < 1000000 {
 		sum += 1
 	}
 }