V8 JavaScript shared memory prototype.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 461578ba85c875bc75dc2be10d7ce8164cc079be..a56f34e4f5acc65683f7690bde34fde12374298f 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6102,6 +6102,13 @@ void JSArrayBuffer::set_should_be_freed(bool value) {
   set_flag(BooleanBit::set(flag(), kShouldBeFreed, value));
 }
 
+bool JSArrayBuffer::is_shared() {
+  return BooleanBit::get(flag(), kShared);
+}
+
+void JSArrayBuffer::set_is_shared(bool value) {
+  set_flag(BooleanBit::set(flag(), kShared, value));
+}
 
 ACCESSORS(JSArrayBuffer, weak_next, Object, kWeakNextOffset)
 ACCESSORS(JSArrayBuffer, weak_first_view, Object, kWeakFirstViewOffset)