go/types, types2: refuse pointer to array as argument to "clear" builtin

go/types, types2: refuse pointer to array as argument to "clear" builtin

The accepted proposal only permits map and slice types.

Updates #56351

Change-Id: I95cf4c856a5ecfcdf564601b6215eda3cb6ba86b
Reviewed-on: https://go-review.googlesource.com/c/go/+/463075
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>