[dev.typeparams] internal/reflectlite: use goarch.PtrSize instead of the...

[dev.typeparams] internal/reflectlite: use goarch.PtrSize instead of the duplicated ptrSize [generated]

[git-generate]
cd src/internal/reflectlite
gofmt -w -r "ptrSize -> goarch.PtrSize" .
goimports -w *.go

Change-Id: I6a55f2aa035ed863785856ddd4fcc519dec15ac9
Reviewed-on: https://go-review.googlesource.com/c/go/+/328347


Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>