[6.2][cxx-interop] Fix a crash with [[no_unique_address]] #81100
+89
−2
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Explanation: Swift does not support storing fields in the padding of the previous fields just yet, so let's not import fields like that from C++. Represent them as opaque blobs instead.
Issue: rdar://149072458
Risk: Low, the fix is targeted at a scenario that was crashing before. Testing: Regression test added.
Original PR: #80786
Reviewer: @j-hui