Vectorize replace_copy for x64 / x86 manually
#5980
+293
−77
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Fix #5908
The auto vectorization recipe applied in #4431 did not work in 17.14.
Another recipe would have worked, but it does not work in the latest Insiders.
So chasing the compiler auto vectorization here appears to be unproductive.
Do not help the compiler ™️
Benchmark results
rc<std::uint8_t>rc<std::uint16_t>rc<std::uint32_t>rc<std::uint64_t>