reflect: add Value.MapRange method and MapIter type

reflect: add Value.MapRange method and MapIter type

Example of use:

	iter := reflect.ValueOf(m).MapRange()
 	for iter.Next() {
		k := iter.Key()
		v := iter.Value()
		...
	}

See issue golang/go#11104

Q. Are there any benchmarks that would exercise the new calls to
   copyval in existing code?

Change-Id: Ic469fcab5f1d9d853e76225f89bde01ee1d36e7a
Reviewed-on: https://go-review.googlesource.com/33572
Reviewed-by: Keith Randall <khr@golang.org>