Nate Chandler a6e8277dea [SILOpt] Added VisitBarrierAccessScopes utility. ...

The new utility finds access scopes which are barriers by finding access
scopes which themselves contain barriers.  This is necessary to (1)
allow hoisting through access scopes when possible (i.e. not simply
treating all end_access instructions as barriers) and (2) not hoist into
access scopes that contain barriers and in so doing introduce
exclusivity violations.

2022-05-21 12:56:51 -07:00

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