[PATCH] [Polly] Extract number of elements/iterations for a isl_set/isl_ast_node

[Johannes Doerfert]

Promoted the trip count to a member of the isl_ast_node payload and used the
new functionality to emit less loop guards than with ScalarEvolution

http://reviews.llvm.org/D4988

Files:
  include/polly/CodeGen/CodeGeneration.h
  include/polly/CodeGen/IslAst.h
  include/polly/Support/GICHelper.h
  lib/CodeGen/IslAst.cpp
  lib/CodeGen/IslCodeGeneration.cpp
  lib/Support/GICHelper.cpp
  test/Isl/CodeGen/no_guard_after_tiling.ll
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