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[MachineCopyPropagation] Refactor copy tracking into a class. NFC

Description

[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.

Details

Committed
bognerSep 20 2018, 5:51 PM
Parents
rL342702: [llvm-objcopy/llvm-strip]: handle --version
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