I’ve been investing the “po performance bug” (<rdar://problem/24534599> po when 
debugging Xcode is extremely slow) in recent Xcode, and I discovered this 
problem.

We are looking at pch files that are generated on Xcode’s behalf and it looks 
like we’re recursing through their dependencies when we don’t find something, 
but we’re probably not searching efficiently because this is super slow.

This would be an Everest regression.

I’m going to keep working on the original Radar because I haven’t gotten 
Brent’s backtrace yet; that said, this one is going to affect users’ perception 
of expression parser performance as well so I’ve filed it separately.

Sean
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