[PATCH] [Polly] Compute and print the loop carried dependency distance

[Johannes Doerfert]

Rebase patch and show unit tests result in phabricator

http://reviews.llvm.org/D4987

Files:
  include/polly/CodeGen/IslAst.h
  include/polly/Dependences.h
  lib/Analysis/Dependences.cpp
  lib/CodeGen/IslAst.cpp
  test/Isl/Ast/dependence_distance_constant.ll
  test/Isl/Ast/dependence_distance_multiple_constant.ll
  test/Isl/Ast/dependence_distance_parametric.ll
  test/Isl/Ast/dependence_distance_parametric_expr.ll
  test/Isl/Ast/dependence_distance_varying.ll
  test/Isl/Ast/dependence_distance_varying_in_outer_loop.ll
  test/Isl/Ast/dependence_distance_varying_multiple.ll
  test/Isl/Ast/reduction_dependences_equal_non_reduction_dependences.ll
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