[PATCH] Add diagnostics to the loop vectorizer cost model

[Tyler Nowicki]

Hi,

Here is a patch that adds diagnostics to the vectorizer cost model. When the cost model determines vectorization is not possible/profitable these remarks print an analysis of that decision. I include one test. It is difficult to find tests that fail at this point. If you know of any please let me know and I will include them.

Note that in selectVectorizationFactor() we can assume that OptForSize and ForceVectorization are mutually exclusive.

Tyler

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