Same gap as posix: windows.ps1 killed before its `hermes update` child took
the lock left a marker that read DEAD while the update went on. The update
step now writes the child as line 4 (Add-MarkerDelegate, compare-and-swap)
right after the job-assigned start.
(cherry picked from commit d29e7f4be8626303de6a73a67b9cb94aec88157a)