[llvm-commits] [PATCH] Move the implementation of LoopInfo into LoopInfoImpl.h.

[Andrew Trick]

I'd like to move the loop discovery algorithm out of the main header before I start changing it.

This makes the LoopInfo interface readable, which I think is extremely important.

Bonus:
While I'm working on it, it speeds up my rebuilds by 4.7x.
And for everyone else working outside LoopInfo, well your builds could be a full second faster ;-)

We've been using the same explicit instantiation strategy in BlockFrequency for a year now and no one has complained. But I thought wait for feedback anyway--hopefully just doxygen nits!

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