[vm/ffi] Re-land "[vm/ffi] FFI callbacks on X64."

There are minor fixes for dartkb and windows.
The original revision is in patchset 1.

Change-Id: I9ab6e5fdb33fb4e84ea520c283fe94323616a8ce
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103129
Commit-Queue: Samir Jindel <sjindel@google.com>
Auto-Submit: Samir Jindel <sjindel@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>

https://dart.googlesource.com/sdk/+/225a30163700d03111079cf63e2c1cda455f8d9b
1 file changed
tree: 32711a0dc54cffa25862466f424b16c56aac36fb
  1. commits.json