This reverts commit 430c75b5fa.
Reason for revert: We probably don't care about the dartkb breakages.
Original change's description:
> Revert "[VM] Remove unnecessary Closure.clone() from sync*."
>
> This reverts commit ca94ad7112.
>
> Reason for revert: Appears to break dartkb.
>
> Original change's description:
> > [VM] Remove unnecessary Closure.clone() from sync*.
> >
> > Instead, this CL wraps sync*'s sync_op in an additional function
> > that captures local copies of the necessary closure state.
> > Notably this state includes the parameters of the original sync* function
> > as these also need to be cloned for each instance.
> >
> >
> > Note: a large number of .expect files have a small number of changes
> > due to the additional wrapper function, as well as some extra plumbing.
> >
> > Bug: https://github.com/dart-lang/sdk/issues/37753
> > Change-Id: If099dbfe9e5d62979626b852386fd0173fc76de5
> > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/136190
> > Commit-Queue: Clement Skau <cskau@google.com>
> > Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
>
> TBR=vegorov@google.com,cskau@google.com
>
> Change-Id: I89e517196f03622337f909f0fcecbdc77c9dda93
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: https://github.com/dart-lang/sdk/issues/37753
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144920
> Reviewed-by: Clement Skau <cskau@google.com>
> Commit-Queue: Clement Skau <cskau@google.com>
TBR=vegorov@google.com,cskau@google.com
Change-Id: I78589c83cbb17151ca4ab8f811b4f18f252fb9c1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: https://github.com/dart-lang/sdk/issues/37753
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144921
Reviewed-by: Clement Skau <cskau@google.com>
Commit-Queue: Clement Skau <cskau@google.com>
1bf25798fa