This fixes a bug where we didn't run before/after hooks for await when
the debugger is not active, as reported downstream in
https://github.com/nodejs/node/issues/20274

Change-Id: I1948d1884c591418d87ffd1d0ccb2bebf4e908f1
Reviewed-on: https://chromium-review.googlesource.com/1039386
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52909}