[PATCH] [Polly] [IslCodeGenerator] Add OpenMP support

[Tobias Grosser]

This new patch has the following changes:

- Addressed most of the review comments of Johannes
- Removed a couple of smaller changes that have been committed individually
- Extracted the changes to the IslAst into http://reviews.llvm.org/D6142
- Full support for SCEV based code generation
- Tested on LNT with and without SCEV based code generation
  - 1 failure with SCEV based code generation due to llvm.org/PR21204
  - 2 failures due to alias information being invalidated by openmp code
    generation

http://reviews.llvm.org/D5517

Files:
  include/polly/CodeGen/IslExprBuilder.h
  include/polly/Support/SCEVValidator.h
  lib/CodeGen/IslCodeGeneration.cpp
  lib/Support/SCEVValidator.cpp
  test/Isl/CodeGen/OpenMP/loop-body-references-outer-iv.ll
  test/Isl/CodeGen/OpenMP/loop-body-references-outer-values-2.ll
  test/Isl/CodeGen/OpenMP/loop-body-references-outer-values-3.ll
  test/Isl/CodeGen/OpenMP/loop-body-references-outer-values.ll
  test/Isl/CodeGen/OpenMP/loop-bounds-reference-outer-ids.ll
  test/Isl/CodeGen/OpenMP/reference-other-bb.ll
  test/Isl/CodeGen/OpenMP/reference-preceeding-loop.ll
  test/Isl/CodeGen/OpenMP/single_loop.ll
  test/Isl/CodeGen/OpenMP/single_loop_with_loop_invariant_baseptr.ll
  test/Isl/CodeGen/OpenMP/single_parallel_loop___%for.i---%exit.jscop
  test/Isl/CodeGen/OpenMP/two-parallel-loops-reference-outer-indvar.ll
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