encoding/binary: cull dead code

Change-Id: I91f9b5280e08e005f5a891aaa249267c211d814b
Reviewed-on: https://go-review.googlesource.com/7592Reviewed-by: Minux Ma <minux@golang.org>

src/encoding/binary/binary.go

@@ -239,78 +239,62 @@ func Write(w io.Writer, order ByteOrder, data interface{}) error {
 		}
 		switch v := data.(type) {
 		case *int8:
-			bs = b[:1]
 			b[0] = byte(*v)
 		case int8:
-			bs = b[:1]
 			b[0] = byte(v)
 		case []int8:
 			for i, x := range v {
 				bs[i] = byte(x)
 			}
 		case *uint8:
-			bs = b[:1]
 			b[0] = *v
 		case uint8:
-			bs = b[:1]
 			b[0] = byte(v)
 		case []uint8:
 			bs = v
 		case *int16:
-			bs = b[:2]
 			order.PutUint16(bs, uint16(*v))
 		case int16:
-			bs = b[:2]
 			order.PutUint16(bs, uint16(v))
 		case []int16:
 			for i, x := range v {
 				order.PutUint16(bs[2*i:], uint16(x))
 			}
 		case *uint16:
-			bs = b[:2]
 			order.PutUint16(bs, *v)
 		case uint16:
-			bs = b[:2]
 			order.PutUint16(bs, v)
 		case []uint16:
 			for i, x := range v {
 				order.PutUint16(bs[2*i:], x)
 			}
 		case *int32:
-			bs = b[:4]
 			order.PutUint32(bs, uint32(*v))
 		case int32:
-			bs = b[:4]
 			order.PutUint32(bs, uint32(v))
 		case []int32:
 			for i, x := range v {
 				order.PutUint32(bs[4*i:], uint32(x))
 			}
 		case *uint32:
-			bs = b[:4]
 			order.PutUint32(bs, *v)
 		case uint32:
-			bs = b[:4]
 			order.PutUint32(bs, v)
 		case []uint32:
 			for i, x := range v {
 				order.PutUint32(bs[4*i:], x)
 			}
 		case *int64:
-			bs = b[:8]
 			order.PutUint64(bs, uint64(*v))
 		case int64:
-			bs = b[:8]
 			order.PutUint64(bs, uint64(v))
 		case []int64:
 			for i, x := range v {
 				order.PutUint64(bs[8*i:], uint64(x))
 			}
 		case *uint64:
-			bs = b[:8]
 			order.PutUint64(bs, *v)
 		case uint64:
-			bs = b[:8]
 			order.PutUint64(bs, v)
 		case []uint64:
 			for i, x := range v {