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Improve generic Index*.

Rika requested to merge runewalsh/source:index into main

Unapplied parts of #39996 (closed).

YMMV, but on my computer my versions are 2× faster on x86-64 that uses them for DWords and QWords. (And always surpass REP SCAS-based assembler implementations of System.IndexWord and System.IndexDWord on i386, especially for small Counts.)

Edited by Rika

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