[WIP] [NO-MERGE] Make "unique" flag more robust and update access enforcement opts to make use of it. #32877

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zoecarver wants to merge 7 commits intoswiftlang:masterfrom

zoecarver:opt/unique-reference-access

Commits on Jul 14, 2020

[SIL] Add a "unique" flag to alloc_ref instructions.
zoecarver
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[SIL] Update unique references to support being passed through multiple
zoecarver
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[SIL] Add support for apply users of unique reference.
zoecarver
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[SIL] Add support for strong_release uses of unique reference.
zoecarver
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[opt] Add pass to promote alloc_refs to unique references.
zoecarver
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[opt] Update AccessedStorage::isUniquelyIdentified to use isUniqueReference information and update AccessEnforcementOpts to promote accesses of unique storage to static access enforcement.
zoecarver
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Commits on Jul 15, 2020

Fix failures while building stdlib+benchmarks:
zoecarver
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