[PATCH] ScalarEvolution backedge taken count computation on LT and GT rewrite

[Michele Scandale]

  Here an updated version of the patch. The conflict was due to rL193514.

  In the current version NoWrap boolean is computed considering only NSW/NUW flags in order to avoid the wrong behavior on NW only flag.

Hi atrick,

http://llvm-reviews.chandlerc.com/D2008

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2008?vs=5103&id=5228#toc

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/2008-11-18-Stride1.ll
  test/Analysis/ScalarEvolution/2008-11-18-Stride2.ll
  test/Analysis/ScalarEvolution/2008-12-15-DontUseSDiv.ll
  test/Analysis/ScalarEvolution/bounded_decrement_loop.ll
  test/Analysis/ScalarEvolution/trip-count3.ll
  test/Analysis/ScalarEvolution/trip-count9.ll
  test/Transforms/IndVarSimplify/loop_evaluate_6.ll
  test/Transforms/IndVarSimplify/no-iv-rewrite.ll
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