deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3

  Original commit message 9365d09:

      [coverage] Rework continuation counter handling

      This changes a few bits about how continuation counters are handled.

      It introduces a new mechanism that allows removal of a continuation
      range after it has been created. If coverage is enabled, we run a first
      post-processing pass on the AST immediately after parsing, which
      removes problematic continuation ranges in two situations:

      1. nested continuation counters - only the outermost stays alive.
      2. trailing continuation counters within a block-like structure are
         removed if the containing structure itself has a continuation.

      R=bmeurer@chromium.org, jgruber@chromium.org, yangguo@chromium.org

      Bug: v8:8381, v8:8539
      Change-Id: I6bcaea5060d8c481d7bae099f6db9f993cc30ee3
      Reviewed-on: https://chromium-review.googlesource.com/c/1339119


Reviewed-by: Yang Guo <yangguo@chromium.org>
      Reviewed-...