[clang] [clang] Instantiate attributes on other decl types (PR #115924)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

The change is reasonable, but I need to see tests for each of the types.

In general, we've had the attitude of "we can enable this instantiation once we see examples of it being useful", so we need tests to make sure it is instantiated, AND that it is useful.

https://github.com/llvm/llvm-project/pull/115924