PR-URL: #44
Reviewed-By: Rod Vagg <rod@vagg.org>

Original commit message:

    Merged: [map] Try to in-place transition during map update

    When searching for a target map during map update, attempt to
    update field representations in-place to the more general
    representation, where possible.

    Bug: chromium:1143772
    No-Try: true
    No-Presubmit: true
    No-Tree-Checks: true

    TBR=leszeks@chromium.org, fgm@chromium.org
    (cherry picked from commit 8e3ae62d294818733a0322d8e8abd53d4e410f19)

    Change-Id: I659890c2f08c14d1cf94242fb875c19837df2dbb
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509599
    Reviewed-by: Francis McCabe <fgm@chromium.org>
    Reviewed-by: Michael Hablich <hablich@chromium.org>
    Reviewed-by: Bill Budge <bbudge@chromium.org>
    Reviewed-by: Igor Sheludko <ishell@chromium.org>
    Cr-Commit-Position: refs/branch-heads/8.6@{nodejs#44}
    Cr-Branched-From: a64aed2333abf49e494d2a5ce24bbd14fff19f60-refs/heads/8.6.395@{#1}
    Cr-Branched-From: a626bc036236c9bf92ac7b87dc40c9e538b087e3-refs/heads/master@{#69472}

Refs: v8/v8@3ba21a1

Original commit message:

    Merged: [map] Try to in-place transition during map update

    When searching for a target map during map update, attempt to
    update field representations in-place to the more general
    representation, where possible.

    Bug: chromium:1143772
    No-Try: true
    No-Presubmit: true
    No-Tree-Checks: true

    TBR=leszeks@chromium.org, fgm@chromium.org
    (cherry picked from commit 8e3ae62d294818733a0322d8e8abd53d4e410f19)

    Change-Id: I659890c2f08c14d1cf94242fb875c19837df2dbb
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509599
    Reviewed-by: Francis McCabe <fgm@chromium.org>
    Reviewed-by: Michael Hablich <hablich@chromium.org>
    Reviewed-by: Bill Budge <bbudge@chromium.org>
    Reviewed-by: Igor Sheludko <ishell@chromium.org>
    Cr-Commit-Position: refs/branch-heads/8.6@{nodejs#44}
    Cr-Branched-From: a64aed2333abf49e494d2a5ce24bbd14fff19f60-refs/heads/8.6.395@{#1}
    Cr-Branched-From: a626bc036236c9bf92ac7b87dc40c9e538b087e3-refs/heads/master@{#69472}

Refs: v8/v8@3ba21a1

Original commit message:

    Merged: [map] Try to in-place transition during map update

    When searching for a target map during map update, attempt to
    update field representations in-place to the more general
    representation, where possible.

    Bug: chromium:1143772
    No-Try: true
    No-Presubmit: true
    No-Tree-Checks: true

    TBR=leszeks@chromium.org, fgm@chromium.org
    (cherry picked from commit 8e3ae62d294818733a0322d8e8abd53d4e410f19)

    Change-Id: I659890c2f08c14d1cf94242fb875c19837df2dbb
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509599
    Reviewed-by: Francis McCabe <fgm@chromium.org>
    Reviewed-by: Michael Hablich <hablich@chromium.org>
    Reviewed-by: Bill Budge <bbudge@chromium.org>
    Reviewed-by: Igor Sheludko <ishell@chromium.org>
    Cr-Commit-Position: refs/branch-heads/8.6@{#44}
    Cr-Branched-From: a64aed2333abf49e494d2a5ce24bbd14fff19f60-refs/heads/8.6.395@{#1}
    Cr-Branched-From: a626bc036236c9bf92ac7b87dc40c9e538b087e3-refs/heads/master@{#69472}

Refs: v8/v8@3ba21a1

PR-URL: #38275
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>