internal/reflectlite: updates reflectlite to match runtime rtype/mapType

internal/reflectlite: updates reflectlite to match runtime rtype/mapType

CL 191198 updated runtime rtype and mapType without adopting the changes
to reflectlite, causing mismatch between them.

This CL updates those changes to reflectlite.

Fixes #34486

Change-Id: I2bb043673d997f97bb0b12c4ad471474803b2160
Reviewed-on: https://go-review.googlesource.com/c/go/+/197559
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Keith Randall <khr@golang.org>