[dev.cc] cmd/asm/internal/asm: fix test on windows

Change-Id: Ia6cf3204d71740bc2b6e26c53ac5206e8a33a180
Reviewed-on: https://go-review.googlesource.com/5540Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/asm/internal/asm/endtoend_test.go

@@ -42,6 +42,8 @@ func testEndToEnd(t *testing.T, goarch string) {
 	}
 	result := string(testOut.Bytes())
 	expect, err := ioutil.ReadFile(output)
+	// For Windows.
+	result = strings.Replace(result, `testdata\`, `testdata/`, -1)
 	if err != nil {
 		t.Fatal(err)
 	}