Strengthen an assertion in AccessSummaryAnalysis.
Strengthen an assertion in AccessSummaryAnalysis.

Mark Lacey caught this bug in the assertion logic that looks for expected SIL
patterns involving non-escaping closures. I broadened it to allow multiple use,
but it was only verifying the first use. This is NFC w.r.t. our automated
testing because that never hits the multiple-use case.

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