Andrew Trick 66752e9724 OSSA: Rewrite address cloning code to fix issues. ...

Generalize the AccessUseDefChainCloner in MemAccessUtils. It was
always meant to work this way, just needed a client.

Add a new API AccessUseDefChainCloner::canCloneUseDefChain().

Add a bailout for begin_borrow and mark_dependence. Those
projections may appear on an access path, but they can't be
individually cloned without compensating.

Delete InteriorPointerAddressRebaseUseDefChainCloner.

Add a check in OwnershipRAUWHelper for canCloneUseDefChain.

Add test cases for begin_borrow and mark_dependence.

2021-02-24 22:18:21 -08:00

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