[PATCH] [Polly][Fix] Teach the IslExprBuilder about vector lanes

[Johannes Doerfert]

Hi grosser, sebpop, dpeixott, simbuerg,

  We can now add an offset to an isl_id in the IslExprBuilder in order
  to adjust the created code for the current vector lane.

  The modified code paths in the VectorBlockGenerator are tested by the
  two test cases.

http://reviews.llvm.org/D5704

Files:
  include/polly/CodeGen/BlockGenerators.h
  include/polly/CodeGen/IslExprBuilder.h
  lib/CodeGen/BlockGenerators.cpp
  lib/CodeGen/IslCodeGeneration.cpp
  lib/CodeGen/IslExprBuilder.cpp
  test/Isl/CodeGen/MemAccess/simple_stride2___%for.cond---%for.end.jscop
  test/Isl/CodeGen/MemAccess/simple_stride___%for.cond---%for.end.jscop.unknown_stride
  test/Isl/CodeGen/MemAccess/simple_stride_test.ll
  test/Isl/CodeGen/MemAccess/simple_stride_test_2.ll
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