reflect: add test that method values have the same code pointers
reflect: add test that method values have the same code pointers

Updates #40592

Change-Id: I16252dd57aceb5c49ddc11d8c12c601ca87ca902
Reviewed-on: https://go-review.googlesource.com/c/go/+/356252
Trust: Cuong Manh Le <54b4457f1dff6823379654eb5867596497ba782f@gmail.com>
Run-TryBot: Cuong Manh Le <54b4457f1dff6823379654eb5867596497ba782f@gmail.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

nawawi/go,cloudflare/go,CAFxX/go,golang/go,nawawi/go,cloudflare/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,cloudflare/go,golang/go,CAFxX/go,golang/go,golang/go,nawawi/go,nawawi/go,CAFxX/go