So an addendum to the entire preceding discussion. I had imagined
STREF/LDREF as the inlined pseudo-instructions, but I now think
(provisionally) that's wrong. I now think we want barrier
pseudo-instructions rather than load/store pseudo-instructions. A single
barrier can cover lots of loads and stores.

While DBT can do liveness tracing on this kind of thing, it's better to
express it up front, I should think.
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