rsmith added a comment. Perhaps we could address both the UB and the debug info homing issue by adding a new attribute on the libc++ types that says it's valid to create an instance of the type without calling a constructor? (If we want to support old libc++ with trunk clang, we could detect those types and automatically synthesize the attribute, but libc++ is moving towards being version-locked to clang anyway, so I don't think we need to worry about that too much.)
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