[PATCH] Optimize insertqi when we copy all the lower 64 bits.

[Filipe Cabecinhas]

  Updated the patch to add range merging, generating fewer insertqi when possible.

  This also allows us to find more places to do the first opt.

Hi grosbach,

http://reviews.llvm.org/D3357

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3357?vs=8482&id=8521#toc

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/vec_demanded_elts.ll
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