[PATCH] D106899: [LLVM][NFC] Remove LLVM_ATTRIBUTE_NORETURN and use [[noreturn]] directly

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

I migrated all llvm/ files. You need to remove them from the patch.

It is a good idea to drop the macro definition in `llvm/include/llvm/Support/Compiler.h` separately.

It makes it easy to bring back the definition if some downstream users want extended time for migration. (Note: downstream is on their own. This is offering kindness, not an obligation of llvm-project.)
For example, swift is using `LLVM_ATTRIBUTE_NORETURN`


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