[llvm-commits] Review request: Hexagon hardware loops

[Krzysztof Parzyszek]

This is a patch that significantly extends the functionality of the 
hardware loop generation on Hexagon.  Main changes are
- separation of the loop fixup pass into its own file,
- handling of nearly arbitrary comparison instructions in loop latches,
- handling of nearly arbitrary lower and upper iteration bounds.

Please review.

Thank you,
-Krzysztof

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