[PATCH] Generalize getExtendAddRecStart to work with both sign and zero extensions.

[Sanjoy Das]

Hi atrick, hfinkel, majnemer,

This change also removes `DEBUG(dbgs() << "SCEV: untested prestart overflow check\n");` because that case has a unit test now.

http://reviews.llvm.org/D7645

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/infer-prestart-no-wrap.ll

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