[6.2][cxx-interop] Diagnose Escapable C++ types with non-escapable fields #80710
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Explanation: In Swift, Escapable types cannot have non-escapable stored properties. Unfortunately, these checks could be circumvented via C++ interop, constructing invalid Swift code. This patch errors out on importing C++ code of this shape.
Issue: rdar://148899224
Risk: Low, the fix is fairly targeted to the affected scenario.
Testing: Added tests to test suite
Original PR: #80671
Reviewer: John Hui