Incompatible with Go 1.23, which doesn't allow //go:linkname to internal symbols, including to runtime package

[stefanb]

While testing Go 1.23 rc1 in

• https://github.com/Homebrew/homebrew-core/pull/175310

there was an error:

  # github.com/ethereum/go-ethereum/cmd/abigen
  link: github.com/fjl/memsize: invalid reference to runtime.stopTheWorld
  util.go:47: exit status 1

Go 1.23 no longer allows //go:linkname * runtime.* link instructioins, see

• https://tip.golang.org/doc/go1.23#linker
• https://github.com/golang/go/issues/67401

It is used several times in this module, see: https://github.com/search?q=repo%3Afjl%2Fmemsize%20linkname&type=code

[fjl]

Crap. So I guess this means this module can't work anymore, or at least not in the way it used to. We need to stop all goroutines in order to traverse registered root pointers without racing with the program.

[fjl]

I have created the above proposal asking the Go developers to consider this module.