deps: V8: cherry-pick 47800791b35c

Original commit message:

    [wasm] Fix DCHECK in AtomicWait after memory growth

    With the changes in crrev.com/c/7003085, calling memory.grow()
    via the JS API didn't immediately update the memory's array buffer
    any more, which triggered a DCHECK in the runtime functions for
    atomic waits. This patch restores immediate updating of the buffer
    for the current isolate, which maintains the other CL's goal to
    not allocate on loop back edges.

    Fixed: 454991459
    Change-Id: Id633cebb9ac24606bc0d8a3df703c74531d3c8a0
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7100806
    Reviewed-by: Clemens Backes <[email protected]>
    Commit-Queue: Clemens Backes <[email protected]>
    Auto-Submit: Jakob Kummerow <[email protected]>
    Cr-Commit-Position: refs/heads/main@{#103431}

Refs: v8/v8@4780079

Author: jakobkummerow

common.gypi

@@ -38,7 +38,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.7',
+    'v8_embedder_string': '-node.8',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/wasm/wasm-objects.cc

@@ -1207,6 +1207,9 @@ int32_t WasmMemoryObject::Grow(Isolate* isolate,
     if (!old_buffer->is_resizable_by_js()) {
       // Broadcasting the update should update this memory object too.
       CHECK(memory_object->needs_new_buffer());
+      // For the current isolate, immediately update the buffer.
+      RefreshSharedBuffer(isolate, memory_object, old_buffer,
+                          ResizableFlag::kNotResizable);
     }
     // As {old_pages} was read racefully, we return here the synchronized
     // value provided by {GrowWasmMemoryInPlace}, to provide the atomic

deps/v8/test/mjsunit/regress/wasm/regress-454991459.js

@@ -0,0 +1,20 @@
+// Copyright 2025 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
+
+let memory = new WebAssembly.Memory({ initial: 1, maximum: 2, shared: true });
+let builder = new WasmModuleBuilder();
+builder.addImportedMemory("m", "memory", 1, 2, "shared");
+builder.addFunction("wait", kSig_i_ii)
+  .addBody([
+    kExprLocalGet, 0, // address
+    kExprLocalGet, 1, // expected_value
+    kExprI64Const, 0, // timeout
+    kAtomicPrefix, kExprI32AtomicWait, 2, 0
+  ])
+  .exportFunc();
+let instance = builder.instantiate({m: {memory}});
+memory.grow(1);
+instance.exports.wait(kPageSize);