a85157e233
This adds support for the newly added `extern.externalize` and `extern.internalize` instructions and uses these for converting to/from `externref` instead of a JS round-trip. Change-Id: If18d8f44ddf013d4c26bf1597be91bcd0db41c5a Cq-Include-Trybots: luci.dart.try:dart2wasm-linux-x64-d8-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/255462 Commit-Queue: Aske Simon Christensen <askesc@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com>