perf: use ArrayBuffer::Data() instead of GetBackingStore()->Data() (#44067)
perf: use ArrayBuffer::Data() API
Replace our `GetBackingStore()->Data()` calls with this instead.
Explained by the V8 docs, ArrayBuffer.Data() is
> More efficient shortcut for GetBackingStore()->Data(). The
> returned pointer is valid as long as the ArrayBuffer is alive.
Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Charles Kerr <charles@charleskerr.com>
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