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31e2d2b86c
This patch greatly improves the performance for the common case of using a
64-bit engine and requesting a length that is a multiple of 8.
It does so by providing a fast path that will just `memcpy()` (which will be
optimized out) the returned uint64_t directly into the output buffer,
byteswapping it for big endian architectures.
The existing byte-wise copying logic was mostly left alone. It only received an
optimization of the shifting and masking that was previously applied to
`Randomizer::getBytesFromString()` in 1fc2ddc996.
Co-authored-by: Saki Takamachi <saki@php.net>