[Issue 18671] Implement loop unrolling in dmd's optimizer

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18671

hsteoh at quickfur.ath.cx changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #1 from hsteoh at quickfur.ath.cx ---
DMD already has loop unrolling. It's there, even though dmd's optimizer still
leaves much to be desired.

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