Remove base from index functions #2083
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Not quite working yet; having those bases forced us to insert load-bearing copies that avoided cases that memory expansion is unable to cope with.
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With this PR, index functions are now just LMADs, with no extra information.
This results in an overall reduction of copies.
However, some of those copies turn out to be load-bearing, so we need
fixes elsewhere, in particular memory expansion.
My hope is that this will lead to the memory handling being simpler
and more intentionally (instead of accidentally) correct.