[llvm-dev] Change LLVM_ATTRIBUTE_DEPRECATED macro to [[deprecated]]

[Christian Sigg via llvm-dev]

The LLVM_ATTRIBUTE_DEPRECATED macro marks e.g. function declarations as
deprecated.

C++14 introduced the [[deprecated]] attribute, and I would like to switch
LLVM's code to that because it's portable, easier to read, and can be
applied to inline functions as well.

https://reviews.llvm.org/D94219 is the first step towards that by changing
the LLVM_ATTRIBUTE_DEPRECATED implementation from __attribute__/__declspec
 to [[deprecated]]. In a follow-up change, I will switch the call sites to
use [[deprecated]] directly and finally remove the macro.

Are there any downsides that I'm missing or any objections?

Thanks! Christian
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