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[perf] Do not retain the read buffer via the frame mask (#2350)

`Receiver#getMask()` stores the frame mask as a view into the buffer
the stream delivered, and `Receiver#getData()` is the only reader. The
view is left in place after the frame is parsed, so it keeps that whole
buffer alive until the next frame overwrites it.

Clearing after the payload is unmasked costs one property store per
frame and allocates nothing.

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