[6.2][cxx-interop] Fix crash in ASTMangler triggered by UsingShadowDecls #82175
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Explanation: We did not handle this declaration kind. This PR makes sure we mangle it the same way we do for the target declaration.
Issue: rdar://152841420
Risk: Low, the fix is small, localized, and straightforward.
Testing: Regression test added.
Original PR: #82144
Reviewer: @egorzhdan @hnrklssn @j-hui