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Implement support for [[maybe_unused]] in C++1z that is based off existing…

Description

Implement support for [[maybe_unused]] in C++1z that is based off existing support for unused, and treat it as an extension pre-C++1z. This also means extending the existing unused attribute so that it can be placed on an enum and enumerator, in addition to the other subjects.

Details

Committed
aaronballmanMar 9 2016, 8:48 AM
Parents
rL263024: [AArch64] Minor cleanup/remove redundant code. NFC.
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