[RFC] preserving loop metadata

[Redmond, Paul]

Hi,

The attached patch is based on the Pekka Jääskeläinen's loop metadata work. I have refactored his work into two classes LoopMetadata and PreserveLoopMetadata.

PreserveLoopMetadata is intended to be used by LoopPasses to preserve the loop metadata after transformations. I have modified LoopRotation as an example (it is a pass which will cause the metadata to get lost) The classes is also intended to make the changes to existing passes as unobtrusive as possible.

If this seems like a reasonable approach I will add some tests and resubmit for review.

paul

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