encoding/binary: check for unsigned integers in intDataSize.

intDataSize ignores unsigned integers, forcing reads/writes to miss the fast path.

Fixes #8956

Change-Id: Ie79b565b037db3c469aa1dc6d0a8a5a9252d5f0a
Reviewed-on: https://go-review.googlesource.com/1777Reviewed-by: Russ Cox <rsc@golang.org>

src/encoding/binary/binary.go

@@ -605,25 +605,25 @@ func (e *encoder) skip(v reflect.Value) {
 // It returns zero if the type cannot be implemented by the fast path in Read or Write.
 func intDataSize(data interface{}) int {
 	switch data := data.(type) {
-	case int8, *int8, *uint8:
+	case int8, uint8, *int8, *uint8:
 		return 1
 	case []int8:
 		return len(data)
 	case []uint8:
 		return len(data)
-	case int16, *int16, *uint16:
+	case int16, uint16, *int16, *uint16:
 		return 2
 	case []int16:
 		return 2 * len(data)
 	case []uint16:
 		return 2 * len(data)
-	case int32, *int32, *uint32:
+	case int32, uint32, *int32, *uint32:
 		return 4
 	case []int32:
 		return 4 * len(data)
 	case []uint32:
 		return 4 * len(data)
-	case int64, *int64, *uint64:
+	case int64, uint64, *int64, *uint64:
 		return 8
 	case []int64:
 		return 8 * len(data)