https://github.com/erichkeane commented:

I think this is a good direction, we should probably alert our downstreams 
@llvm/clang-vendors to make sure they are comfortable with the new node/having 
to deal with the new node in AST searches.

We should probably make sure our AST-matchers has a way of seeing these?

Also: I'm a bit concerned about the additional memory pressure, the 
`ExplicitInstantiationDecl` is pretty huge.  Can we measure the difference in 
memory usage in some sort of major project here to see?  

I'm also interested in if this has a sizable negative effect on compile times, 
we have the tracker, but I don't recall how to start it (@Endilll ?).

https://github.com/llvm/llvm-project/pull/191658
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