[clang] [clang] Support [[]] spelling for noderef (PR #190100)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

This attribute has been around almost 10 years now (ad7ac964e5cf1), so changing the behavior this much seems inappropriate.  I don't mind adding the spelling change, but doing this much work UNDER The context of changing the spelling is inappropriate.


https://github.com/llvm/llvm-project/pull/190100