Delete a zero-diff quirk and update INDEX
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#70398
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Following up on #69917.
We're expecting a small number of CSE-induced diffs in test code. These are (mostly) regressions because without the quirk we lose the
IND
part of an unused index indirection, thus losing the ability to CSE it together with other, used, index indirections. There is no easy fix for this issue, and I do not think it is worth keeping the quirk around for the couple of tests which hit it.Diffs.