Ran the tests against -updates and -proposed on a Pi 4, Pi 3B+, and Pi
Zero 2 with the following results:

= Raspberry Pi 4 =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          83.58 |          83.03 |   -0.66%
    65536 |         156.08 |         155.69 |   -0.25%
   131072 |         292.88 |         291.93 |   -0.33%
   262144 |         543.00 |         550.95 |    1.47%
   524288 |         596.54 |         612.14 |    2.62%
  1048576 |         640.72 |         643.76 |    0.47%

= Raspberry Pi 3B+ =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          55.55 |          55.38 |   -0.31%
    65536 |          98.39 |          98.36 |   -0.03%
   131072 |         173.72 |         169.80 |   -2.26%
   262144 |         165.05 |         161.24 |   -2.31%
   524288 |         146.80 |         147.16 |    0.25%
  1048576 |         221.23 |         221.32 |    0.04%

= Raspberry Pi Zero 2 =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          39.09 |          39.32 |    0.58%
    65536 |          70.09 |          70.33 |    0.34%
   131072 |         125.40 |         122.88 |   -2.01%
   262144 |         133.79 |         133.76 |   -0.02%
   524288 |         134.59 |         133.84 |   -0.56%
  1048576 |         203.99 |         203.89 |   -0.04%

Looking much better than before; some mild improvement (and not too much
cost) on the Pi 4 (the only platform where arm64 typically makes sense
in the Pi series), and only minor degradation in the rest.

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https://bugs.launchpad.net/bugs/1951032

Title:
  AArch64: Backport memcpy improvements

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