[PATCH] Induction variables: support arbitrary constant step

[Alexey Volkov]

Hi nadav, hfinkel,

Now for induction variables it's possible to have only -1 and +1 step values.
This patch adds support for other than +1 and -1 constant step values.

http://reviews.llvm.org/D6051

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/const-induction.ll
  test/Transforms/LoopVectorize/gcc-examples.ll
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