Justin Bogner 45b3ddc5a4 [MachineCopyPropagation] Refactor copy tracking into a class. NFC ...

This is a bit easier to follow than handling the copy and src maps
directly in the pass, and will make upcoming changes to how this is
done easier to follow.

llvm-svn: 342703

2018-09-21 00:51:04 +00:00

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