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Fix the access order for open-existential l-values #9584

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rjmccall
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Don't eagerly begin the access to the existential l-value in an open-existential l-value during formal evaluation. There's no reason this can't wait until the access begins.

rdar://32039566

open-existential l-value during formal evaluation.

This causes unnecessarily conflicts for static enforcement, among
other potential problems.

rdar://32039566
@rjmccall
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@swift-ci Please test and merge.

@rjmccall
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@swift-ci Please smoke test.

@rjmccall
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@swift-ci Please smoke test Linux.

@rjmccall rjmccall merged commit 9acf019 into swiftlang:master May 14, 2017
@rjmccall rjmccall deleted the existential-lvalue-access-ordering branch May 14, 2017 17:55
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