[PATCH] Cleanup register pressure calculation in MachineLICM

[Quentin Colombet]

> Regression testing has revealed that there is actually one more distinction to be made to avoid functional changes in this refactoring: Whether to count unseen registers as defs. Now, there are no regressions in the LLVM test suite.


Could you add the related test to make check?
I like to improve our code coverage in make check when we get the chance :).

Other than that LGTM.

Thanks,
-Quentin


http://reviews.llvm.org/D8604

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