[PATCH][Loop Vectorizer] Identify basic FP recurrences in LoopVectorizer

[Tyler Nowicki]

Hi,

This patch builds on the refactoring patches in "[PATCH][VECTORIZER] Refactor ReductionDescriptor to also support floating-point recurrences".

The patch identifies basic floating-point recurrences and emits diagnostic remarks when a recurrence is found. Tests in the patch look for the diagnostic messages to verify the recurrences were found.

Subsequent patches will make the loop vectorizer generate code for the basic recurrences. Basic recurrences are a lot like the basic reductions that are already identified and vectorized.

Thanks,

Tyler

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