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-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
        Commit-Queue: Jakob Gruber <jgruber@chromium.org>
        Cr-Commit-Position: refs/heads/master@{#58443}

    Refs: v8/v8@9365d09

    Original commit message aac2f8c:

        [coverage] Filter out singleton ranges that alias full ranges

        Block coverage is based on a system of ranges that can either have
        both a start and end position, or only a start position (so-called
        singleton ranges). When formatting coverage information, singletons
        are expanded until the end of the immediate full parent range. E.g.
        in:

        {0, 10}  // Full range.
        {5, -1}  // Singleton range.

        the singleton range is expanded to {5, 10}.

        Singletons are produced mostly for continuation counters that track
        whether we execute past a specific language construct.

        Unfortunately, continuation counters can turn up in spots that confuse
        our post-processing. For example:

        if (true) { ... block1 ... } else { ... block2 ... }

        If block1 produces a continuation counter, it could end up with the
        same start position as the else-branch counter. Since we merge
        identical blocks, the else-branch could incorrectly end up with an
        execution count of one.

        We need to avoid merging such cases. A full range should always take
        precedence over a singleton range; a singleton range should never
        expand to completely fill a full range. An additional post-processing
        pass ensures this.

        Bug: v8:8237
        Change-Id: Idb3ec7b2feddc0585313810b9c8be1e9f4ec64bf
        Reviewed-on: https://chromium-review.googlesource.com/c/1273095


Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
        Commit-Queue: Jakob Gruber <jgruber@chromium.org>
        Cr-Commit-Position: refs/heads/master@{#56531}

    Refs: v8/v8@aac2f8c

    deps: V8: backport 47d34a3

    Original commit message:

        Revert "[coverage] change block range to avoid ambiguity."

        This reverts commit 471fef0469d04d7c487f3a08e81f3d77566a2f50.

        Reason for revert: A more general fix incoming at https://crrev.com/c/1273095.

        Original change's description:
        > [coverage] change block range to avoid ambiguity.
        >
        > By moving the block range end to left of closing bracket,
        > we can avoid ambiguity where an open-ended singleton range
        > could be both interpreted as inside the parent range, or
        > next to it.
        >
        > R=<U+200B>verwaest@chromium.org
        >
        > Bug: v8:8237
        > Change-Id: Ibc9412b31efe900b6d8bff0d8fa8c52ddfbf460a
        > Reviewed-on: https://chromium-review.googlesource.com/1254127


> Reviewed-by: Georg Neis <neis@chromium.org>
        > Commit-Queue: Yang Guo <yangguo@chromium.org>
        > Cr-Commit-Position: refs/heads/master@{#56347}

        TBR=yangguo@chromium.org,neis@chromium.org,verwaest@chromium.org

        # Not skipping CQ checks because original CL landed > 1 day ago.

        Bug: v8:8237
        Change-Id: I39310cf3c2f06a0d98ff314740aaeefbfffc0834
        Reviewed-on: https://chromium-review.googlesource.com/c/1273096


Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
        Commit-Queue: Jakob Gruber <jgruber@chromium.org>
        Cr-Commit-Position: refs/heads/master@{#56513}

    Refs: https://github.com/v8/v8/commit/47d34a317e47bad86b68326607cd2e6de3901f3e

PR-URL: https://github.com/nodejs/node/pull/25429


Reviewed-By: Yang Guo <yangguo@chromium.org>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>