Replace godep with dep

vendor/golang.org/x/text/internal/testtext/gc.go

@@ -0,0 +1,14 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !gccgo
+
+package testtext
+
+import "testing"
+
+// AllocsPerRun wraps testing.AllocsPerRun.
+func AllocsPerRun(runs int, f func()) (avg float64) {
+	return testing.AllocsPerRun(runs, f)
+}