[Issue 7157] Optimiser is O(n^2) w.r.t. function length

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=7157

--- Comment #8 from Martin Nowak <code at dawg.eu> ---
Another case of this.
https://github.com/etcimon/botan/issues/8
It took dmd almost 13 minutes to compile botan w/ release optimizations on
heroku (and about 4 minutes on my local machine).

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