[libc++] Fix -Wdeprecated-copy warnings in __bit_reference
Add a couple of default copy constructors to fix the warning. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D71395
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Add a couple of default copy constructors to fix the warning. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D71395