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

[hfinkel at anl.gov]

Please commit the BypassBlock -> VectorPreHeader rename now, and then rebase this patch. That will make the remainder easier to review.


================
Comment at: test/Transforms/LoopVectorize/induction.ll:116
@@ -115,3 +115,1 @@
 ; CHECK-LABEL: max_i32_backedgetaken
-; CHECK:  %backedge.overflow = icmp eq i32 -1, -1
-; CHECK:  br i1 %backedge.overflow, label %scalar.ph, label %overflow.checked
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You've removed the check for the icmp. Why?

http://reviews.llvm.org/D9332

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