go/types: move to exp/types per Go 1 plan

This package is only used by gotype at the moment.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5266042

src/cmd/gotype/gotype.go

@@ -5,13 +5,13 @@
 package main
 
 import (
+	"exp/types"
 	"flag"
 	"fmt"
 	"go/ast"
 	"go/parser"
 	"go/scanner"
 	"go/token"
-	"go/types"
 	"io/ioutil"
 	"os"
 	"path/filepath"

src/pkg/Makefile

@@ -85,6 +85,7 @@ DIRS=\
 	exp/sql\
 	exp/sql/driver\
 	exp/template/html\
+	exp/types\
 	expvar\
 	flag\
 	fmt\
@@ -95,7 +96,6 @@ DIRS=\
 	go/printer\
 	go/scanner\
 	go/token\
-	go/types\
 	gob\
 	hash\
 	hash/adler32\

src/pkg/go/types/Makefile → src/pkg/exp/types/Makefile

@@ -4,7 +4,7 @@
 
 include ../../../Make.inc
 
-TARG=go/types
+TARG=exp/types
 GOFILES=\
 	check.go\
 	const.go\