[PATCH] Refactor code for adding runtime checks in vectorizer.

[David Majnemer]

Any reason we can't use the IRBuilder instead of `BranchInst::Create`?

A side effect is that it would make it a little easier to make:

  br i1 true, label %scalar.ph, label %overflow.checked

simply:

  br label %scalar.ph

by specializing the builder's `CreateCondBr` to "Do the Right Thing (TM)" when given a constant condition.


http://reviews.llvm.org/D9332

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