deps: V8: cherry-pick 0188634

Original commit message:

    [ptr-compr][ubsan] Use [Read/Write]UnalignedValue for unaligned fields

    When pointer compression is enabled the [u]intptr_t and double fields are
    only kTaggedSize aligned so in order to avoid undefined behavior in C++ code
    we have to access these values in an unaligned pointer friendly way although
    both x64 and arm64 architectures (where pointer compression is supported)
    allow unaligned access.

    These changes will be removed once v8:8875 is fixed and all the
    kSystemPointerSize fields are properly aligned.

    Bug: v8:7703
    Change-Id: I4df477cbdeab806303bb4f675d52b61c06342c8e
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528996
    Commit-Queue: Igor Sheludko <ishell@chromium.org>
    Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    Reviewed-by: Jakob Gruber <jgruber@chromium.org>
    Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#60321}

Refs: https://github.com/v8/v8/commit/0188634ee523aef39ba71732b1ab9d422f449825

PR-URL: https://github.com/nodejs/node/pull/27013
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 2 insertions, 1 deletions

diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 7346e0bbbc..7e48cd422d 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -118,6 +118,7 @@ class Arguments;
 class DeferredHandles;
 class Heap;
 class HeapObject;
+class ExternalString;
 class Isolate;
 class LocalEmbedderHeapTracer;
 class MicrotaskQueue;
@@ -2797,7 +2798,7 @@ class V8_EXPORT String : public Name {
     void operator=(const ExternalStringResourceBase&) = delete;
 
    private:
-    friend class internal::Heap;
+    friend class internal::ExternalString;
     friend class v8::String;
     friend class internal::ScopedExternalStringLock;
   };