[PATCH] Fix PR21694 - Revert improper use of divide in SCEV HowFarToZero computation

[Mark Heffernan]

Hi atrick, majnemer,

r219517 added a use of SCEV divide in HowFarToZero computation.  This divide can produce incorrect results as we are using an unsigned divide for what should be a modular divide.  This change reverts back to a more conservative computation using trailing zeros.

http://reviews.llvm.org/D6546

Files:
  lib/Analysis/ScalarEvolution.cpp
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