[PATCH] Reducing the costs of cast instructions to enable more vectorization of smaller types in LoopVectorize

[Sam Parker]

Now use SmallPtrSet and ValueMap in place of the standard containers for the instructions and types found by the new function.
Also compare against APInt::getMaxValue as Silviu suggested.
Removed metadata from test file.


http://reviews.llvm.org/D9822

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll

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