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

[Michael Zolotukhin]

Hi aschwaighofer, nadav, hfinkel, anemet,

Currently this code is very hard to manage:
 - variables defined in the beginning of the function might be used several
   screens later
 - Code for adding checks isn't uniform enough (some use Instruction::Create,
   others use IRBuilder)
 - Code for adding one check is tangled with code for adding next check, because
   we split basic block only at that time.
I tried to fix this issues, and hopefully that improves the code readability.

http://reviews.llvm.org/D9332

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/induction.ll

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