runtime: improve synchronization in TestFinalizerRegisterABI
Replace busy-wait with a channel. Change-Id: I51ddfd5dbde15fff56c62c618570e66930902cbb Reviewed-on: https://go-review.googlesource.com/c/go/+/310630 Trust: Austin Clements <austin@google.com> Run-TryBot: Austin Clements <austin@google.com> Reviewed-by:Michael Knyszek <mknyszek@google.com> TryBot-Result: Go Bot <gobot@golang.org>
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