Add Rpass-missed and Rpass-analysis reports to the loop vectorizer

[Tyler Nowicki]

Hi Diego, Arnold,

Here is a patch for adding Rpass-missed and Rpass-analysis reports to the loop vectorizer. To check that the correct analysis is reported I am using the existing loop vectorization tests. I haven’t updated all of the tests yet because I wanted to make sure I was on the right path.

Let me know what you think.

Tyler

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