test/bench: enable build and test on Windows

R=golang-dev, rsc1
CC=golang-dev
https://golang.org/cl/4366043

src/run.bash

@@ -113,7 +113,6 @@ do
 done
 
 [ "$GOARCH" == arm ] ||
-[ "$GOHOSTOS" == windows ] ||
 (xcd ../test/bench
 ./timing.sh -test
 ) || exit $?

test/bench/regex-dna-parallel.go

@@ -89,7 +89,7 @@ func countMatches(pat string, bytes []byte) int {
 
 func main() {
 	runtime.GOMAXPROCS(4)
-	bytes, err := ioutil.ReadFile("/dev/stdin")
+	bytes, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "can't read input: %s\n", err)
 		os.Exit(2)

test/bench/regex-dna.go

@@ -87,7 +87,7 @@ func countMatches(pat string, bytes []byte) int {
 }
 
 func main() {
-	bytes, err := ioutil.ReadFile("/dev/stdin")
+	bytes, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "can't read input: %s\n", err)
 		os.Exit(2)