[PATCH] [LV] Statistics numbers for LoopVectorize introduced: a number of analyzed loops & a number of vectorized loops.

[Zinovy Nis]

Hi hfinkel, nadav,

Use //-stats// to see how many loops were analyzed for possible vectorization and how many of them were actually vectorized.

This patch is a splitted version of http://reviews.llvm.org/D3423.

http://reviews.llvm.org/D3438

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/vect.stats.ll
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