perf(span): hash Span as a single u64
#8299
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#8298 made
Spanaligned on 8 on 64-bit platforms. Utilize this property to hashSpanas a singleu64instead of 2 xu32s. This reduces hashing aSpanwithFxHashto 3 instructions (down from 7), and 1 register (down from 3). https://godbolt.org/z/4q36xrWG8