deps: V8: cherry-pick e0a109c

Original commit message:

    [api] Implement StartupData::CanBeRehashed() for the snapshot blob

    This enables the embedder to check if the snapshot generated
    from SnapshotCreator::CreateBlob() can be rehashed and the seed
    can be recomputed during deserialization.

    The lack of this functionality resulted in a temporary vunerability
    in Node.js: https://github.com/nodejs/node/pull/27365

    Change-Id: I88d52337217c40f79c26438be3c87d2db874d980
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1578661
    Commit-Queue: Joyee Cheung <joyee@igalia.com>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#61175}

Refs: https://github.com/v8/v8/commit/e0a109c05821fa36ec20e1f25895c23baa8d64c3

PR-URL: https://github.com/nodejs/node/pull/27533
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann (רפאל פלחי) <refack@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 1edcf81189..d8141d3b41 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -8609,6 +8609,13 @@ class V8_EXPORT Isolate {
 
 class V8_EXPORT StartupData {
  public:
+  /**
+   * Whether the data created can be rehashed and and the hash seed can be
+   * recomputed when deserialized.
+   * Only valid for StartupData returned by SnapshotCreator::CreateBlob().
+   */
+  bool CanBeRehashed() const;
+
   const char* data;
   int raw_size;
 };