Michael Gottesman 2f9d67de18 [move-only] Add a new pass called MoveOnlyTypeEliminator that runs after move only checking. ...

This pass lowers moveonly-ness from the IR after we have finished move only
checking. The transform can be configured in two ways: such that it only handles
trivial types and such that it does trivial and non-trivial types. For ease of
use, I created two top level transforms (TrivialMoveOnlyTypeEliminator and
MoveOnlyTypeElimintor) that invoke the two behaviors by configuring the
underlying transform slightly differently.

For now, I am running first the trivial-only and then the all of the above
lowering. The trivial only pass will remain at this part of the pipeline
forever, but with time we are going to move the lower everything pass later into
the pipeline once I have audited the optimizer pipeline to just not perform any
work on move only types. That being said, currently we do not have this
guarantee and this patch at least improves the world and lets us codegen no
implicit copy code again.

2022-06-22 15:31:57 -07:00

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