In the VM-specific async transformation, an index is used to generate
fresh temporary names for values that are live across an await.
Before it was always 0 when translating a statement because there are
no live values on entry or exit to a statement.
When translating statements nested inside block expressions there can
be live values, so the index should not be reset.
Closes https://github.com/dart-lang/sdk/issues/36466
Change-Id: I6103d75c25f312ab1538a7c0f8fee0fea9f01b27
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98664
Commit-Queue: Kevin Millikin <kmillikin@google.com>
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
Kevin Millikin
b700223542